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Twenty
Twenty (20) is the natural number following nineteen and preceding twenty-one.
Twenty is a composite number, its proper divisors being 1, 2, 4, 5 and 10.
Twenty is used as a base number for vigesimal number systems.
In the old UK currency system, there were twenty shillings in a pound.
A group of twenty is often referred to as a score.
A polyhedron with twenty faces is an icosahedron.
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