A Bijective Function

If f:NN f: \mathbb{N}\mapsto \mathbb{N} is a bijective function that satisfies

f(xy)=f(x)f(y) f(xy ) = f(x) f(y)

and f(2015)=42 f(2015) = 42 , what is the minimum value of f(2000) f(2000) ?

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