21357680

素因数分解:

$2^4\times 5^1\times {\mathrm{266971}}^1$

素因数の和:266984

約数の個数: 20

約数和(自身を含む): 49656792

約数和(自身を除く): 28299112

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266971, 533942, 1067884, 1334855, 2135768, 2669710, 4271536, 5339420, 10678840, 21357680]

約数ペア:

[(1, 21357680), (2, 10678840), (4, 5339420), (5, 4271536), (8, 2669710), (10, 2135768), (16, 1334855), (20, 1067884), (40, 533942), (80, 266971)]