No number exists.
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Zero is not a factor of any number but zero.
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0 because having zero amount of any number leaves you with zero
it is not a factor becuase um......(what is think im just 10) 0 times 0 is nothing so take nothing and put it here.........................nothing(so 0)is not a factor becuse there has to be a number 1 and up becuase nothing is 0 so 0 is nothing hehehe
The GCF of zero and any other number is the other number.
You can't have the greatest common factor of just one number - for it to be common there needs to be at least 2 numbers.
Since one is a factor of all non-zero integers, all numbers have common factors.