21509159

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{3761}}^1$

素因数の和:3830

約数の個数: 16

約数和(自身を含む): 26484480

約数和(自身を除く): 4975321

約数列:

[1, 7, 19, 43, 133, 301, 817, 3761, 5719, 26327, 71459, 161723, 500213, 1132061, 3072737, 21509159]

約数ペア:

[(1, 21509159), (7, 3072737), (19, 1132061), (43, 500213), (133, 161723), (301, 71459), (817, 26327), (3761, 5719)]