Q: What is the sum of all factors of the number 12,390 excluding 12,390?
A: 22,170
The factors of the number 12,390 are: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 59, 70, 105, 118, 177, 210, 295, 354, 413, 590, 826, 885, 1239, 1770, 2065, 2478, 4130, 6195, 12390.
If you add them up, you will get the total of 12,412. Now subtract 12,390 to get 22,170