The only prime n umber between 20 and 25 is 23.
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The composite numbers between 20 and 25 are 21, 22, and 24. 23 is the only prime number between 20 and 25.
The only prime number between 25 and 30 is 29.
The number is 875 and its prime factors are 5; 5; 5 & 7.
29
It is: 13