10 and 4
The sum of the factors of any negative number is zero.
10 and -5 are factors of -20.
Factors for 20 are: 1, 2, 4, 5, 10, 20 Prime Factors: 2, 5 sum of prime factors = 2 + 5 = 7
2,4,8,10 and 16 are factors of 400.
Factors of 20 are 1, 2, 4, 5, 10 and 20. And their sum is 1 + 2 + 4 + 5 + 10 + 20 = 32.
8 and 12 are factors of 20, 8 + 12 = 20
The prime factors of 14 are 2 and 7. 2 + 7 = 9.
-14 and -21
Two factors of 56 with a sum of 18 are 8 and 10.
20 and 30.
24
14 and 2