Q: What is the sum of all factors of the number 1,620 excluding 1,620?

 A: 3,462

Why is 3,462 the sum of all factors of 1,620, excluding 1,620?

The factors of the number 1,620 are: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 81, 90, 108, 135, 162, 180, 270, 324, 405, 540, 810, 1620.

If you add them up, you will get the total of 1,623. Now subtract 1,620 to get 3,462


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