Q: What is the sum of all factors of the number 840 excluding 840?

Why is 2,040 the sum of all factors of 840, excluding 840?

The factors of the number 840 are: 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840.

If you add them up, you will get the total of 842. Now subtract 840 to get 2,040

More numbers for you to try...

Try the factor calculator