With the convention without an additional constraint on for every integer
* With the convention that be nonzero, for every nonzero integer

General

Divisors can be negative as well as positive, although often the term is restricted to positive divisors. For example, there are six divisors of 4; they are 1, 2, 4, -1, -2, and -4, but only the positive ones (1, 2, and 4) would usually be mentioned.

1 and -1 divide (are divisors of) every integer. Every integer (and its

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