20 (number)

20 (twenty) is the natural number following 19 and preceding 21. A group of twenty units may also be referred to as a score.

In mathematics

  • 20 is a tetrahedral number as 1, 4, 10, 20.
  • 20 is the basis for vigesimal number systems.
  • 20 is the third composite number comprising the product of a squared prime and a prime, and also the second member of the (22)q family in this form.
  • 20 has an aliquot sum of 22 (110% in abundance). Accordingly, 20 is the third abundant number and demonstrates an 8-member aliquot sequence; {20, 22, 14, 10, 8, 7, 1, 0}.
  • 20 is the smallest primitive abundant number.
  • 20 is the 4th composite number in the 7-aliquot tree. Two numbers have 20 as their aliquot sum; the discrete semiprime 34 and the squared prime 361. Only 2 other square primes are abundant 12 and 18.
  • An icosahedron has 20 faces. A dodecahedron has 20 vertices.
  • 20 can be written as the sum of three Fibonacci numbers uniquely, i.e. 20 = 13 + 5 + 2.
  • The product of the number of divisors and the number of proper divisors of 20 is exactly 20.
  • 20th (Light) Division

    The 20th (Light) Division was an infantry division of the British Army, part of Kitchener's Army, raised in the First World War. The division was formed in September 1914 as part of the K2 Army Group. The division landed in France July 1915 and spent the duration of the First World War in action on the Western Front.

    Formation

  • 10th (Service) Battalion, King's Royal Rifle Corps (disbanded February 1918)
  • 11th (Service) Battalion, King's Royal Rifle Corps
  • 10th (Service) Battalion, Rifle Brigade (disbanded February 1918)
  • 11th (Service) Battalion, Rifle Brigade
  • 2nd Battalion, Cameronians (Scottish Rifles) (from February 1918)
  • 6th (Service) Battalion, Oxfordshire and Buckinghamshire Light Infantry ( disbanded February 1918)
  • 6th (Service) Battalion, King's Shropshire Light Infantry
  • 12th (Service) Battalion, King's Royal Rifle Corps
  • 12th (Service) Battalion, Rifle Brigade
  • 7th (Service) Battalion, Somerset Light Infantry
  • 7th (Service) Battalion, Duke of Cornwall's Light Infantry
  • 20th (album)

    20th is the seventh live album by the jazz fusion group Casiopea released in 2000. This is also a live recording of the 20th anniversary of Casiopea and their thirty-third album overall.

    Track listing

    Personnel

    CASIOPEA are

    Supported

    Additional Musicians

    Production

  • Sound Produced – CASIOPEA
  • Recording & Mixing Engineer – Hiroyuki Shimura, Masatatsu Tsubuki
  • Release history

    References


    Podcasts:

    PLAYLIST TIME:

    Won't Get Fooled Again

    by: The Who

    We'll be fighting in the streets
    With our children at our feet
    And the morals that they worship will be gone
    And the men who spurred us on
    Sit in judgement of all wrong
    They decide and the shotgun sings the song
    I'll tip my hat to the new constitution
    Take a bow for the new revolution
    Smile and grin at the change all around
    Pick up my guitar and play
    Just like yesterday
    Then I'll get on my knees and pray
    We don't get fooled again
    The change, it had to come
    We knew it all along
    We were liberated from the fold, that's all
    And the world looks just the same
    And history ain't changed
    'Cause the banners, they are flown in the next war
    I'll tip my hat to the new constitution
    Take a bow for the new revolution
    Smile and grin at the change all around
    Pick up my guitar and play
    Just like yesterday
    Then I'll get on my knees and pray
    We don't get fooled again
    No, no!
    I'll move myself and my family aside
    If we happen to be left half alive
    I'll get all my papers and smile at the sky
    Though I know that the hypnotized never lie
    Do ya?
    There's nothing in the streets
    Looks any different to me
    And the slogans are replaced, by-the-bye
    And the parting on the left
    Are now parting on the right
    And the beards have all grown longer overnight
    I'll tip my hat to the new constitution
    Take a bow for the new revolution
    Smile and grin at the change all around
    Pick up my guitar and play
    Just like yesterday
    Then I'll get on my knees and pray
    We don't get fooled again
    Don't get fooled again
    No, no!
    Yeaaaaaaaaaaaaaaaaaaaaaaaaah!
    Meet the new boss
    Same as the old boss




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