2 × 7 = 14, so and 7 are both factors of 14

1 × 20 =
2 × 10 = 4 × 5 = 20 5 × 4 = 20 10 × 2 = 20 20 × 1 = 20 The factors of 20, from least to greatest, are 1, 2, , 5, , 20 
Is 2 a factor of 85?
yes
no

What are the common factors of 74 and 12?
1, 