If a is a natural number not equal to 0, and 540 / A is also a natural number, then a can take () natural numbers

If a is a natural number not equal to 0, and 540 / A is also a natural number, then a can take () natural numbers

540 decomposition quality factors are: 2, 2, 3, 3, 5. So the natural numbers that meet the requirements are: 1 quality factor, 3: 2, 3, 5. 2 quality factor, 5: 4, 6, 10, 9, 15. 3 quality factor, 6: 20, 12, 18, 30, 27, 45. 4 quality factor, 5: 90, 54