Q: What is the sum of all factors of the number 13,815 excluding 13,815?
A: 10,209
The factors of the number 13,815 are: 1, 3, 5, 9, 15, 45, 307, 921, 1535, 2763, 4605, 13815.
If you add them up, you will get the total of 13,825. Now subtract 13,815 to get 10,209