How many trees are in our forest ?

Question

There is a forest with trees. On each and every tree in the forest, exactly the same number of birds are sitting on it (ex. "There are 5 trees and each tree has 5 birds on it"). The birds in the forest is a given number between 200 and 300.
How many trees are in our forest(such that there is no other combination of trees and birds to acquire the same product)?

Answer 1

it should be 15, or 16, 17.