Six of them.
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90 and any factor of 90 for example, 10 and 90
30 has four factor pairs:30,115,210,36,5
(90,1)(45,2)(30,3)(18,5)(15,6)(10,9)
The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.
"Dose" is a measured portion of a medicine. I am not aware of any factor pairs related to dose 27 or any other measured quantities of medication!27 does have 2 factor pairs.