20 is a pronic number.; 20 is a tetrahedral number as 1, 4, 10, 20.; 20 is the basis for vigesimal number systems.; 20 is the third composite number to be the product of a squared prime and a prime, and also the second member of the (2 2)q family in this form.; 20 is the smallest primitive abundant number.; An icosahedron has 20 faces. A dodecahedron has 20 vertices.Fun (stylized fun.) was an American indie pop band based in New York City.The band was formed by Nate Ruess (former lead singer of The Format), Andrew Dost (formerly of Anathallo), and Jack Antonoff (of Steel Train and Bleachers). To date, Fun has released two albums Aim and Ignite in August 2009 and Some Nights in February 2012. The band is best known for three hit singles from Some Nights ...
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