Highly Composite Number/Examples/2

Example of Highly Composite Number
$2$ is a highly composite number, being the smallest positive integer with $2$ divisors or more.

Proof
From :
 * $\map {\sigma_0} 2 = 2$

From :
 * $\map {\sigma_0} 1 = 1$

That is, the only positive integer smaller than $2$ has a smaller number of divisors.

Thus, despite not actually being composite, $2$ is a highly composite number.