Three of them and they are: 2, 3 and 5
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The factors of 30 that are not prime numbers are 6, 10 and 30.
The prime factors of 20 are 2 and 5. The prime factors of 30 are 2, 3 and 5.
Factors can be prime or composite. The factors of 30 are 1,2,3,5,6,10,15 and 30. Of these, 3 and 5 are prime. The rest are composite except for 1, which is neither.
I think that these are the factors of 30: 1,2,3,5,6,10,15,30 The prime numbers that are also factors are: 2,3,5
30 is the first with three distinct prime factors.