Q: What is the sum of all factors of the number 8,440 excluding 8,440?
A: 10,640
The factors of the number 8,440 are: 1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 4220, 8440.
If you add them up, you will get the total of 8,450. Now subtract 8,440 to get 10,640