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Omni-MATH / How many positive integers n≤20000 have the properties that 2n has 64 positive divisors including 1 and 2n, and 5n has 60 positive divisors including 1 and 5n?

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problem

How many positive integers n≤20000n \leq 20000 have the properties that 2n2n has 64 positive divisors including 1 and 2n2n, and 5n5n has 60 positive divisors including 1 and 5n5n?
Plain-text mathematical notation (without MathML)
How many positive integers n≤20000 have the properties that 2n has 64 positive divisors including 1 and 2n, and 5n has 60 positive divisors including 1 and 5n?
Original LaTeX notation
How many positive integers $n \leq 20000$ have the properties that $2n$ has 64 positive divisors including 1 and $2n$, and $5n$ has 60 positive divisors including 1 and $5n$?

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