Multiples of 10.
A number will always have 1 and itself as factors. And thus the only numbers with 2 factors will be prime numbers. The only prime numbers below 20 are 2, 3, 5, 7, 11, 13, 17 and 19, and thus these are the only numbers below 20 that have 2 factors.
2 and 5. The factors of 50 (i.e., the whole numbers that evenly divide into 50) are 2, 5, 10, 25, and 50. Of these numbers, only 2 and 5 are prime numbers.
two numbers that have factors of 2, 5 and 7 are 70 and 140.
That could either be "What numbers have 5 factors" or "What numbers have 2 and 5 as factors." Prime numbers to the fourth power, like 16 and 81, have 5 factors. Any multiple of 10 has 2 and 5 as a factor.
Prime numbers have two factors. 2, 3 and 5 are prime numbers.
3, 5 and 7 have 2 factors. 81, 625 and 2401 have 5 factors.
2 and 5
All prime numbers have only two factors. 2, 3, 5, 7, 11
360 and 630 are to such numbers.
Those numbers are among the factors of 170.
The prime factors of 20 are 2, 2, and 5.
The prime numbers (factors) of 320 are: 2 and 5