Q: What is the sum of all factors of the number 15,405 excluding 15,405?

 A: 11,475

Why is 11,475 the sum of all factors of 15,405, excluding 15,405?

The factors of the number 15,405 are: 1, 3, 5, 13, 15, 39, 65, 79, 195, 237, 395, 1027, 1185, 3081, 5135, 15405.

If you add them up, you will get the total of 15,416. Now subtract 15,405 to get 11,475


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