There are eleven of them including 20
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20,21,22,24,25,26,27,28,30
The composite numbers between 10 and 20 are 12, 14, 15, 16 and 18.
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.
12,14,15,16, and 18
There are 7 composite numbers from 10 to 20 (including the boundaries):10, 12, 14, 15, 16, 18 and 20