How about: 4+12 = 16
16 and 3
14 and 2
63? But it has more than two one-digit factors.
The two numbers whose sum is 58 and whose difference is 16 are 21 and 37.
64 + 16
The sum of the factors of 2^16 - 1 = 65535 is 299.
13 and 3
54 and 16.
16 and 3
14 and 2
7 and 9
7 and 9
24 and 16 are factors of 48
63.
Factors for 16 are: 1, 2, 4, 8, 16 Sum = 1 + 2 + 4 + 8 + 16 = 31
63? But it has more than two one-digit factors.
63