524,288

Number
$524 \, 288$ (five hundred and twenty-four thousand, two hundred and eighty-eight) is:
 * $2^{19}$


 * The $19$th power of $2$ after $(1)$, $2$, $4$, $8$, $16$, $\ldots$, $16 \, 384$, $32 \, 768$, $65 \, 536$, $131 \, 072$, $262 \, 144$:
 * $524 \, 288 = 2^{19}$


 * The $20$th almost perfect number after $1$, $2$, $4$, $8$, $16$, $\ldots$, $16 \, 384$, $32 \, 768$, $65 \, 536$, $131 \, 072$, $262 \, 144$:
 * $\map \sigma {524 \, 288} = 1 \, 048 \, 575 = 2 \times 524 \, 288 - 1$