6: 1, 2, 3, 6
6 is.
6
The smallest number that has both twenty-four and thirty as factors is 120.
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).
1155
10
Among positive integers, 6
3
This depends on what you mean by smallest. The smallest four-digit whole number is 1,000; the smallest four-digit real number is .0001 (1/10,000); the smallest four-digit integer is -9,999.
10, which has the factors 1,2,5 and 10. If the trivial pair 1 and the number itself are disallowed, the answer is 12 with factors 2,3,4 and 6.
That would be the same as the smallest four-digit even number: 1,000, which also happens to be the smallest four-digit whole number.
The smallest four digit number is 1000. It is even so 1001 is the smallest four digit number that is odd.