21117680

素因数分解:

$2^4\times 5^1\times {\mathrm{23}}^2\times {\mathrm{499}}^1$

素因数の和:558

約数の個数: 60

約数和(自身を含む): 51429000

約数和(自身を除く): 30311320

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 40, 46, 80, 92, 115, 184, 230, 368, 460, 499, 529, 920, 998, 1058, 1840, 1996, 2116, 2495, 2645, 3992, 4232, 4990, 5290, 7984, 8464, 9980, 10580, 11477, 19960, 21160, 22954, 39920, 42320, 45908, 57385, 91816, 114770, 183632, 229540, 263971, 459080, 527942, 918160, 1055884, 1319855, 2111768, 2639710, 4223536, 5279420, 10558840, 21117680]

約数ペア:

[(1, 21117680), (2, 10558840), (4, 5279420), (5, 4223536), (8, 2639710), (10, 2111768), (16, 1319855), (20, 1055884), (23, 918160), (40, 527942), (46, 459080), (80, 263971), (92, 229540), (115, 183632), (184, 114770), (230, 91816), (368, 57385), (460, 45908), (499, 42320), (529, 39920), (920, 22954), (998, 21160), (1058, 19960), (1840, 11477), (1996, 10580), (2116, 9980), (2495, 8464), (2645, 7984), (3992, 5290), (4232, 4990)]