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Q: How many factor pairs does 819 have?

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As a product of its prime factors: 3*3*7*13 = 819

819 273,3 91,3,3 13,7,3,3

Sixteen factor pairs.

2 factor pairs

There are 3 factor pairs of 16.

Three factor pairs

30 has four factor pairs:30,115,210,36,5

225 has five factor pairs:225,175,345,525,915,15

20 has 3 factor pairs. Pairs are (1,20), (2,10) and (9,9)

12 has 3 factor pairs and the pairs are (1,12), (2,6) and (3,4).

76 has 3 factor pairs: (1,76), (2,38), (4,19).

"Dose" is a measured portion of a medicine. I am not aware of any factor pairs related to dose 18 or any other measured quantities of medication!18 does have 3 factor pairs.

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