30 has 8 factors, 1, 2, 3, 5, 6, 10, 15, and 30.
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.
25 it's factors are 1, 5,and 25. That's a number between 12 and 40 that has only 3 factors
25 does.
1 has the least factors.
25
25
A number that has exactly an odd number of factors is a power of another number. A number between 10 and 30 that is a power is 16. It is 24 (as well as 42) and its factors are 1, 2, 4, 8, and 16.
There is no such number with "most factors"; if you have a number with a certain number of factors, you can always multiply it by 2, or by 3, etc., to get another number that has even more factors.
21
50
These numbers between 1 and 40 have an odd number of factors: 4, 9, 16, 25, 36.
24 does.