21376720

素因数分解:

$2^4\times 5^1\times {\mathrm{191}}^1\times {\mathrm{1399}}^1$

素因数の和:1603

約数の個数: 40

約数和(自身を含む): 49996800

約数和(自身を除く): 28620080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 191, 382, 764, 955, 1399, 1528, 1910, 2798, 3056, 3820, 5596, 6995, 7640, 11192, 13990, 15280, 22384, 27980, 55960, 111920, 267209, 534418, 1068836, 1336045, 2137672, 2672090, 4275344, 5344180, 10688360, 21376720]

約数ペア:

[(1, 21376720), (2, 10688360), (4, 5344180), (5, 4275344), (8, 2672090), (10, 2137672), (16, 1336045), (20, 1068836), (40, 534418), (80, 267209), (191, 111920), (382, 55960), (764, 27980), (955, 22384), (1399, 15280), (1528, 13990), (1910, 11192), (2798, 7640), (3056, 6995), (3820, 5596)]