The numbers 23 and 29 are the only prime numbers between 20 and 30
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There are 457 such numbers.
The three prime numbers between 20 and 35 are 23, 29, and 31.
18, 20, 22, 24, 26. 5 even integers
There are 4 prime numbers between 10 and 20. They are 11, 13, 17, and 19.
23 is the only prime number between 20 and 28.