How many factors of 1800 are multiples of 10?

Interesting.

Factors of 180: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, and 180.

[ (ten times) each of these ] is a factor of 1,800 = 18 factors

Plus, from the list above, we can also pick 10, 20, 30, 60, 90 and 180 = 6 more factors

Total = 24 factors