1, the number of factors of a number is limited, the smallest factor is 1, and the largest factor is itself.

2. The multiple of a number is infinite. The minimum multiple is itself, there is no maximum multiple.

3. 1 is a factor of any natural number (except 0). It is also the smallest factor of any natural number (except 0).

4. A number has at least 1 factor, and this number is 1. Any integer other than 1 has at least two factors (except 0).

5. The factors of a number are all less than or equal to itself, and the multiples of a number are all greater than or equal to itself.

6. The minimum multiple of a number = the maximum factor of a number = this number.

Note: For convenience, when studying factors and multiples, we refer to integers (generally excluding 0).

Definition of expanded data: The common factor of two or more integers is called their common factor.

The greatest common factor of two or more integers is called their greatest common factor.

Inference: 1 is the common factor of any number of integers.

Between two nonzero natural numbers with multiple relationships, the smaller number is the greatest common factor of these two numbers.

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