No it is prime, it is divisible by 2,4,5,10, and 20.
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It is composite.
The next composite number after 20 is 21.
the composite number is 23
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.
the composite number is 23