2,3,5,7,11,13,17,19
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2,3,5,7,11,13,17,19
All the prime numbers less than 20 are 2,3,5,7,11,13,17,19
23, 29, 31, 37
A prime number can be less than 20, but it is not a requirement that the number has to be under 20 to be considered prime. Here is a list of all the prime numbers under 20: 2, 3, 5, 7, 11, 13, 17, and 19 .
The prime factors of 20 are 2x2x5.