Number of Odd Divisors

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Number of Odd Divisors

## Formula

For:

$$N=2^a p_2^{a_2}\cdots p_k^{a_k}$$

the number of odd divisors is:

$$(a_2+1)(a_3+1)\cdots(a_k+1)$$

## Usage

- Used to count divisors that are not divisible by $2$.

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