Q: What is the sum of all factors of the number 20,978 excluding 20,978?
A: 12,394
The factors of the number 20,978 are: 1, 2, 17, 34, 617, 1234, 10489, 20978.
If you add them up, you will get the total of 20,990. Now subtract 20,978 to get 12,394