Q: What is the sum of all factors of the number 15,981 excluding 15,981?
A: 8,403
The factors of the number 15,981 are: 1, 3, 7, 21, 761, 2283, 5327, 15981.
If you add them up, you will get the total of 15,989. Now subtract 15,981 to get 8,403