Q: What is the sum of all factors of the number 687,980 excluding 687,980?
A: 793,780
The factors of the number 687,980 are: 1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 839, 1678, 3356, 4195, 8390, 16780, 34399, 68798, 137596, 171995, 343990, 687980.
If you add them up, you will get the total of 688,773. Now subtract 687,980 to get 793,780