21 = 3x7
23 = prime
25 = 5x5
27 = 3x9
29 = prime
31 = prime
33 = 3x11
35 = 5x7
37 = prime
39 = 3x13
23 is the only prime number between 20 and 29.
23 is the only prime number between 20 and 28.
The only prime n umber between 20 and 25 is 23.
23
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.
47 is the largest prime number between 20 and 50.
17
For a number to have [only] 2 factors, it must be a prime number; the prime numbers between 0 and 20 are; 2, 3, 5, 7, 11, 13, 17, 19
17The prime numbers between 10 and 20 are 11, 13, 17 and 19. There is only one square number between 10 and 20: 16. Using the criteria given, the number that fits is 17.
19 is prime.
Only four:- 23,29,31 and 37.
The composite numbers between 20 and 25 are 21, 22, and 24. 23 is the only prime number between 20 and 25.