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 .
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The prime number that is greater than 20 but less than 29 is 23.
All the prime numbers less than 20 are 2,3,5,7,11,13,17,19
The greatest prime number less than 20 is 19. For there to be a difference, we'll have to have another value.
19
3