A number is a multiple of 18, which is also a factor of 18. Guess what the number is______ .

A number is a multiple of 18, which is also a factor of 18. Guess what the number is______ .

According to the analysis of the meaning of the question: the maximum factor and the minimum multiple of a number are both its own, so a number is not only a multiple of 18, but also a factor of 18. The number is 18