4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20.
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29 is prime, all the others in the list are composite.
12,14,15,16, and 18
9 and 15 only.
The composite numbers that are between 1 and 20 inclusive are: 4 6 8 9 10 12 14 15 16 18 20 This is a total of eleven composite numbers equal to 20 and below.
10 12 14 16 18 and 20