46

Number
$46$ (forty-six) is:


 * $2 \times 23$


 * The $16$th semiprime after $4, 6, 9, 10, 14, 15, 21, 22, 25, 26, 33, 34, 35, 38, 39$:
 * $46 = 2 \times 23$


 * The $3$rd of the $1$st ordered quadruple of consecutive integers that have sigma values which are strictly decreasing:
 * $\sigma \left({44}\right) = 84$, $\sigma \left({45}\right) = 78$, $\sigma \left({46}\right) = 72$, $\sigma \left({47}\right) = 48$


 * The $29$th positive integer after $2, 3, 4, 7, 8, \ldots, 33, 37, 38, 42, 43, 44, 45$ which cannot be expressed as the sum of distinct pentagonal numbers.