which list shows all the factors of 20? 1, 20 1, 2, 4, 5 1, 2, 10, 20 1, 2, 4, 5, 10, 20

Explanation:

Step1: Recall factor definition

A factor of a number divides the number evenly.

Step2: Find factors of 20

$20\div1 = 20$, $20\div2=10$, $20\div4 = 5$, $20\div5=4$, $20\div10 = 2$, $20\div20=1$. So factors are 1, 2, 4, 5, 10, 20.

Answer:

1, 2, 4, 5, 10, 20