None of them is a Prime number.
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None of them are prime numbers
The composite numbers between 20 and 25 are 21, 22, and 24. 23 is the only prime number between 20 and 25.
3, 13, 17, 23 are prime numbers. The others are not.
21 has two prime factors.
No, 21 and 23 are not twin prime numbers. Twin primes are pairs of prime numbers that differ by 2, such as 3 and 5, or 11 and 13.