3 and 7
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Prime numbers are 3 and 2. Factors are 1,2,3,6.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 21 is composite.
2 and 3 are the prime factors of 36. Of the factors of 36, 2 and 3 are the only prime numbers.
The prime factors of 20 are 2, 2, and 5.
The prime numbers (factors) of 320 are: 2 and 5