The sum of the positive whole-number factors of 30 is 72.
The sum of all the positive factors of 12 is 28.
105 is the sum
-5 and -6
32
The sum of the positive whole-number factors of 30 is 72.
5 and 6 are factors of 30 that, when added together, provide a sum of 11.
26
The prime factors of 30 are: 2 + 3 + 5 = 10
20 and 30.
The factors of 29 are 1 and 29. Their sum is 30.
26
The sum of all the positive factors of 12 is 28.
5 and 6
There aren't any numbers like that. You might be thinking of 28, which has a sum of all its factors equal to twice itself, making it a perfect number. Proper factors are a different set.
Add them up. The prime factors of 30 are 2, 3 and 5. You can handle the rest.
13