Q: What is the sum of all factors of the number 1,053 excluding 1,053?

 A: 641

Why is 641 the sum of all factors of 1,053, excluding 1,053?

The factors of the number 1,053 are: 1, 3, 9, 13, 27, 39, 81, 117, 351, 1053.

If you add them up, you will get the total of 1,694. Now subtract 1,053 to get 641


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