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2 3 5 7 11 13 17 19.
The prime factors of 20 are 2x2x5.
The prime numbers of 20 are 2, 2 and 5. (2*2*5 = 20)
The prime numbers between 20 and 30 are 23 and 29.
There are two prime numbers between 20 and 30 which are 23 and 29