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There is only 1, the number 54.
There are none.
49
666 integers.
There are 44 positive integers less than 2,010 that have an odd number of factors.
405
52
There are 20.
10*9*8=720
There are 870 such numbers.
There is only 1, the number 54.
125
Three of them.
3
There are 21.
There are none.
20. 16 without repeating a digit.