100 has nine factors: 1, 2, 4, 5, 10, 20, 25, 50, 100.
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The factors of 8 are 1, 2, 4, and 8. The factors that add up to 10 are 2 and 8.
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It wasn't me, but I would have come up with 33. The four factors of 33 add up to 48.
When the "factors" of a number are listed, the list is usually restricted to positive factors. Then there would be no answer to the question, because no group of positive numbers can add up to make zero.