Divisor summatory function
= Divisor summatory function
{wiki=Divisor_summatory_function}
The divisor summatory function, often denoted as \\( \\sum_\{n \\leq x\} d(n) \\), is a function that counts the total number of divisors of natural numbers up to \\( x \\). Specifically, \\( d(n) \\) represents the number of positive divisors of an integer \\( n \\).