Multiply the 4 smallest prime numbers...
2 X 3 X 5 X 7 = 210
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The smallest positive factor of any positive integer is the number 1. If negative factors are allowed, the smallest factor is the negative of the absolute value of any integer.
If by "least number" you mean "smallest positive integer", then the answer is the product of the three smallest primes: 2x3x5 = 30
230
The smallest positive integer is 1. The largest negative integer is -1. 1 > -1
It is 192.