Prime numbers between the given numbers are 23 and 29
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The prime factors of 20 are 2 and 5. The prime factors of 30 are 2, 3 and 5.
There are two prime numbers between 20 and 30 which are 23 and 29
Because the other numbers have more than two factors
The prime numbers between 20 and 30 are 23 and 29.
The question does not make sense since 20 and 30 are not prime numbers!