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It is a square number because 20 times 20 = 400
20 is a composite number 20 is an even number 20 has factors of 1, 2, 4, 5, 10 and 20 20 is a score meaning twenty 20 as an improper fraction is 20/1 20 as a decimal is 20.0 20 as a Roman numeral is XX
11+9 12+8 10+10 13+7 14+6 15+5 16+4 17+3 18+2 19+1 these are the 20 facts hope it helps u :)
it is a odd number
1000 is not a prime number