Q: What is the sum of all factors of the number 128,720 excluding 128,720?
A: 170,740
The factors of the number 128,720 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1609, 3218, 6436, 8045, 12872, 16090, 25744, 32180, 64360, 128720.
If you add them up, you will get the total of 128,890. Now subtract 128,720 to get 170,740