2, 3, 5, 7, 11, 13, 17 and 19.
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The prime numbers of 20 are 2, 2 and 5. (2*2*5 = 20)
There are three: 23, 29 and 31
The prime factors of 20 are 2, 2, and 5.
The numbers 2, 3, 5, 7, 11, 13, 17 and 19 are prime.
3 5 7 11 13 17 19.