What prime factor is 20 multiplied be 77?

Answer 1

1, 7, 11, 77

Depending on what exactly you need you may or may not need to include 1 and/or 77; and 1 and 77 as well as 7 and 11 may or may not need to be grouped (paired).

Answer 2

The prime factors of 20 are 2 and 5. The prime factors of 77 are 7 and 11. 20 times 77 is 1540 which has, as you might expect, the prime factors 2, 5 , 7 and 11, but is not prime.

Answer 3

2 x 2 = 4

7

2 x 2 x 5 = 20

2 x 2 x 5 x 7 = 140, the LCM