Q: What is the sum of all factors of the number 12,978 excluding 12,978?
A: 19,470
The factors of the number 12,978 are: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 103, 126, 206, 309, 618, 721, 927, 1442, 1854, 2163, 4326, 6489, 12978.
If you add them up, you will get the total of 12,997. Now subtract 12,978 to get 19,470