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.
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    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
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    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


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