They are any of the following prime numbers: 2 3 5 7 11 13 17 19 and 23
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1 has the least factors.
Square numbers have an odd number of factors. Other numbers have an even number of factors. The squares between 12 and 40 include 16, 25, and 36. If the number has only three factors, it must be the square of a prime number, since two of the factors will be 1 and itself, so if there is only one more factor, this third number cannot have factors itself. This means the number must be 25, whose factors are 1, 5, and 25. Response: 24 has (at least) three factors - 1, 2, 3, 4, 6, 8, 12, and 24 .
These numbers between 1 and 40 have an odd number of factors: 4, 9, 16, 25, 36.
24 has the most factors of all the numbers between 1 and 25. The 8 factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24.
1, 5, 25 are the only factors of 25. So, there are 3 factors of 25. Note: We only care about POSITIVE INTEGERS.