Q: What is the sum of all factors of the number 20,990 excluding 20,990?
A: 16,810
The factors of the number 20,990 are: 1, 2, 5, 10, 2099, 4198, 10495, 20990.
If you add them up, you will get the total of 21,006. Now subtract 20,990 to get 16,810