20, yes. The rest, no.
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15 is a composite number - it can be divided by 3 and 5. 11, 13, 17 and 19 are all prime numbers, not composite.
20 is a composite number because it has more than 2 factors
The only composite factor of 10 is 10. The composite factors of 20 are 4, 10, 20
11, 13, 15, 17, and 19 does.
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