Q: What is the sum of all factors of the number 6,420 excluding 6,420?

 A: 11,724

Why is 11,724 the sum of all factors of 6,420, excluding 6,420?

The factors of the number 6,420 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 107, 214, 321, 428, 535, 642, 1070, 1284, 1605, 2140, 3210, 6420.

If you add them up, you will get the total of 6,431. Now subtract 6,420 to get 11,724


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