Two: 1 and 53.
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None, 53 is a prime number.
Including 10 and 53 there are 44 numbers. Excluding 10 and 53 there would be 42 numbers.1011121314151617181920212223242526272829303132333435363738394041424344454647484950515253
Only 1 and 53 ... it's a prime number
There are 20 natural numbers between 32 and 53.
Since 53 is a prime number, its only prime factor is itself.