64 (1, 2, 4, 8, 16, 32, 64)
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).
36
11
The smallest number is 504. There are no common factors other than 3x3, 2x2x2, and 7, so they must be multiplied together.
240 has 20 factors.
70 is the smallest number that has prime factors of 2,5 and 7
If you mean 2, 3 and 7 as factors then the smallest number is 42
There are none but the smallest 3 digit number is 161
70
70
70
It is 7 because as the product of its prime factors they are: 7*151*223 = 235,711
210 with factors of 2, 3, 5, and 7
number 1155
84
42
It is 2^6 = 64.