4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20
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There are eleven of them including 20
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.
Composite numbers are positive integers greater than 1 that have more than two factors. Between 15 and 25, the composite numbers are 16, 18, 20, 21, 22, 24. These numbers can be divided evenly by factors other than 1 and themselves, making them composite.
10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25
All of them except for 11, 13, 17 and 19 which are prime numbers