23
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23 is the only prime number between 20 and 28.
The prime numbers between 1 and 20 are: 2, 3, 5, 7, 11, 13, 17 and 19. Note that a prime number has only two factors, 1 and itself and one. Number 1 is not considered to be a prime number because it has only one factor.
The prime numbers between 20 and 30 are 23 and 29.
The numbers 23 and 29 are the only prime numbers between 20 and 30
Oh, let's take a moment to appreciate the beauty of numbers! Between 20 and 25, the number 23 is a prime number. It stands tall and strong on its own, with only two factors - 1 and itself. Just like a happy little tree, standing proudly in the sunlight.