1 has the least factors.
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1, 5, 25
24: 1, 2, 3, 4, 6, 8, 12, 24
1, 2, 3, 4, 6, 8, 12, 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.