Q: What is the sum of all factors of the number 1,680 excluding 1,680?
A: 4,272
The factors of the number 1,680 are: 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 28, 30, 35, 40, 42, 48, 56, 60, 70, 80, 84, 105, 112, 120, 140, 168, 210, 240, 280, 336, 420, 560, 840, 1680.
If you add them up, you will get the total of 1,684. Now subtract 1,680 to get 4,272