Three and they are: 1, 2 and 4
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4 factors they are 1,3,7 and 21
The limit is infinity if the factors do not have to be whole numbers. If you stipulate that the factors have to be whole numbers, then, yes, for each number, there is a limit to how many factors it has. For example, the number 4 has only 3 whole-number factors: 1, 2, and 4.
125 has the following factors: 1,125,5 & 25. Therefore there are 4 factors.
There are 4 prime numbers under ten.
Five: 1, 2, 4, 8 and 16.