The sum of not even numbers within 20 is () and the prime of not odd numbers is ()
All prime numbers within 20 are: 2, 3, 5, 7, 11, 13, 17, 19
All the numbers within 20 are: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18
By comparison, the composite numbers within 20 that are not even numbers are 9 and 15, and the prime numbers that are not odd numbers are 2