4? the factors of 4 are 1,4 and 2
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192
1024
6. Factors are 1, 2, 3, and 6.
the answer would seem to be ten.
Logically, the smallest number with 4 different prime factors would have to be the product of the smallest four prime numbers. So the smallest natural number with four different prime factors is 210 (2*3*5*7).