15 does.
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All square numbers have an odd number of factors.
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45
Well, isn't that a happy little question! To find the greatest odd factor of a number, you simply need to look for the largest odd number that can divide it evenly. Start by finding all the factors of the number, then pick the largest odd number from that list. Just remember, there are no mistakes, only happy little accidents in math!
All nonzero numbers have factors. Some factors are odd numbers. 3 is an odd factor of 12.