36 has nine factors
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The number with the most factors between 21 and 40 is 30. Factors of a number are the numbers that can divide the original number without leaving a remainder. The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30, giving it a total of 8 factors, which is the highest among the numbers between 21 and 40.
These numbers between 1 and 40 have an odd number of factors: 4, 9, 16, 25, 36.
That number is 36.
31 and 37
36