Product of All Positive Divisors of a Number

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Based on my current knowledge, the formula for finding the product of all positive divisors of a number $n$ is $= n^{\frac{\tau (n)}{2}}$ where the function $\tau (n)$ outputs the number of positive divisors for that number $n$. However, wouldn't this formula only work for those and only those numbers who have an even number of divisors? In that case, what is the method used to determine the product of all positive divisors of a number with an odd number of positive divisors? Thank you in advance.