It is: 28
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A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. The largest prime number between 18 and 24 is 23.
184 is composite. 184 = 2 * 2 * 2 * 23 = 23 * 23
Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
The composite numbers between 20 and 25 are 21, 22, and 24. 23 is the only prime number between 20 and 25.
There is none because 23 is a prime number