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The composite numbers up to 20 are 4,6,8,9,12,14,15,16,18 and 20.
The only composite factor of 10 is 10. The composite factors of 20 are 4, 10, 20
20 is a composite number because it has more than 2 factors
Since 20 is evenly divisible by 2, 4, 5, and 10, in addition to '1' and itself, I think it is a composite number.Since 20 is evenly divisible by 2, 4, 5, and 10, in addition to '1' and itself, I think it's probably composite.
20, 21, 22, 24, 25, 26, 27, 28, 30 are composite.