Divisor Count of 17,796,126,877,482,329,126,047
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Example of Use of Divisor Count Function
- $\map {\sigma_0} {17 \, 796 \, 126 \, 877 \, 482 \, 329 \, 126 \, 047} = 48$
where $\sigma_0$ denotes the divisor count function.
Proof
From Divisor Count Function from Prime Decomposition:
- $\ds \map {\sigma_0} n = \prod_{j \mathop = 1}^r \paren {k_j + 1}$
where:
- $r$ denotes the number of distinct prime factors in the prime decomposition of $n$
- $k_j$ denotes the multiplicity of the $j$th prime in the prime decomposition of $n$.
We have that:
- $17 \, 796 \, 126 \, 877 \, 482 \, 329 \, 126 \, 047 = 11^5 \times 23 \times 107 \times 44 \, 900 \, 425 \, 217 \, 777$
Thus:
\(\ds \) | \(\) | \(\ds \map {\sigma_0} {17 \, 796 \, 126 \, 877 \, 482 \, 329 \, 126 \, 047}\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds \map {\sigma_0} {11^5 \times 23^1 \times 107^1 \times 44 \, 900 \, 425 \, 217 \, 777^1}\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds \paren {5 + 1} \times \paren {1 + 1} \times \paren {1 + 1} \times \paren {1 + 1}\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds 6 \times 2^3\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds 48\) |
$\blacksquare$