The number 20 is a whole number that follows 19 and precedes 21. It is an even number and can be expressed in various mathematical forms, such as a multiple of 10 (2 x 10) or as a sum of integers (e.g., 10 + 10). In Roman numerals, 20 is represented as XX. It is also the base of the vigesimal numeral system, which uses 20 as its base.
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