Just 16.
Prime numbers between the given numbers are 23 and 29
They are the numbers that have more than two factors in them.
1, 2, 4, 5, 10, 20
26
Because the other numbers have more than two factors
23, 29 and 31 are the prime numbers in that range.
6, 8, 10, 14 and 15.
All of them except 23 and 29 which are prime numbers having only two factors
There are infinitely many numbers with 20 factors. yes there is
They are the only ones with just two factors.
If you include 30, both 24 and and 30 have 8 factors, the most in that range.
The prime factors of 20 are 2, 2, and 5.