Q: What is the sum of all factors of the number 21,980 excluding 21,980?
A: 31,108
The factors of the number 21,980 are: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 157, 314, 628, 785, 1099, 1570, 2198, 3140, 4396, 5495, 10990, 21980.
If you add them up, you will get the total of 22,011. Now subtract 21,980 to get 31,108