21356240

素因数分解:

$2^4\times 5^1\times {\mathrm{266953}}^1$

素因数の和:266966

約数の個数: 20

約数和(自身を含む): 49653444

約数和(自身を除く): 28297204

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266953, 533906, 1067812, 1334765, 2135624, 2669530, 4271248, 5339060, 10678120, 21356240]

約数ペア:

[(1, 21356240), (2, 10678120), (4, 5339060), (5, 4271248), (8, 2669530), (10, 2135624), (16, 1334765), (20, 1067812), (40, 533906), (80, 266953)]