1 has the least factors.
21
These numbers between 1 and 40 have an odd number of factors: 4, 9, 16, 25, 36.
24 has the most factors. It has eight factors. Factors of 24 are 1, 2, 3, 4, 6, 8, 12 & 24.
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 .
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.
30 has 8 factors, 1, 2, 3, 5, 6, 10, 15, and 30.
24 does.
25
25
The numbers between 10 and 30 that have exactly 5 factors are 16 and 25. The number 16 has factors 1, 2, 4, 8, and 16. The number 25 has factors 1, 5, 25, but since it is a perfect square, it also includes the repeated factor of 5. These are the only two numbers between 10 and 30 that have exactly 5 factors.
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
24 does.
50