What is a number between 0 and 20 that has two factors?

Answer 1

2, 3, 5, 7, 11, 13, 17, and 19 each have two factors . . . '1' and itself.

Answer 2

A number between 0 and 20 that has exactly two factors is a Prime number. Prime numbers are natural numbers greater than 1 that can only be divided by 1 and themselves without leaving a remainder. An example of a prime number between 0 and 20 is 17, as it can only be divided by 1 and 17 evenly.

Answer 3

They are: 2 3 5 7 11 13 17 and 19 which have only two factors because they are all prime numbers