20886820

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{149}}^1\times {\mathrm{163}}^1$

素因数の和:364

約数の個数: 48

約数和(自身を含む): 45460800

約数和(自身を除く): 24573980

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 149, 163, 172, 215, 298, 326, 430, 596, 652, 745, 815, 860, 1490, 1630, 2980, 3260, 6407, 7009, 12814, 14018, 24287, 25628, 28036, 32035, 35045, 48574, 64070, 70090, 97148, 121435, 128140, 140180, 242870, 485740, 1044341, 2088682, 4177364, 5221705, 10443410, 20886820]

約数ペア:

[(1, 20886820), (2, 10443410), (4, 5221705), (5, 4177364), (10, 2088682), (20, 1044341), (43, 485740), (86, 242870), (149, 140180), (163, 128140), (172, 121435), (215, 97148), (298, 70090), (326, 64070), (430, 48574), (596, 35045), (652, 32035), (745, 28036), (815, 25628), (860, 24287), (1490, 14018), (1630, 12814), (2980, 7009), (3260, 6407)]