Five: 1, 2, 4, 8 and 16.
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7 factors. They are: 1, 2, 4, 8, 16, 32, 64
2 3 4 6 8 12 16 24 are the distinct/different factors of 48
16 if the prime factors don't have to be distinct. 210 if they do.
120 is the lowest of many.
Indeed, the number 16 has 5 factors, 1, 2, 4, 8, and 16.