What are the factors and prime factors of 20 and 50?

The factors of 20 are: 1, 2, 4, 5, 10, and 20.
The prime factors of 20 are: 2 and 5.

The factors of 50 are: 1, 2, 5, 10, 25, and 50.
The prime factors of 50 are: 2 and 5.