5020

Number
$5020$ (five thousand and twenty) is:
 * $2^2 \times 5 \times 251$


 * The smaller of the $4$th amicable pair, with $5564$:
 * $\map {\sigma_1} {5020} = \map {\sigma_1} {5564} = 10 \, 584 = 5020 + 5564$