Q: What is the sum of all factors of the number 153 excluding 153?

 A: 81

Why is 81 the sum of all factors of 153, excluding 153?

The factors of the number 153 are: 1, 3, 9, 17, 51, 153.

If you add them up, you will get the total of 234. Now subtract 153 to get 81


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