There are two numbers whose greatest common factor is 18 and least common multiple is 108. What is the number? What is the formula?

There are two numbers whose greatest common factor is 18 and least common multiple is 108. What is the number? What is the formula?

18=2x3x3,108=2x3x3x2x3,
So, these two numbers may be 18 and 108, or they may be 2x3x3x2 = 36 and 2x3x3x3 = 54