20449940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{43}}^2\times {\mathrm{79}}^1$

素因数の和:181

約数の個数: 72

約数和(自身を含む): 50883840

約数和(自身を除く): 30433900

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 43, 70, 79, 86, 140, 158, 172, 215, 301, 316, 395, 430, 553, 602, 790, 860, 1106, 1204, 1505, 1580, 1849, 2212, 2765, 3010, 3397, 3698, 5530, 6020, 6794, 7396, 9245, 11060, 12943, 13588, 16985, 18490, 23779, 25886, 33970, 36980, 47558, 51772, 64715, 67940, 95116, 118895, 129430, 146071, 237790, 258860, 292142, 475580, 584284, 730355, 1022497, 1460710, 2044994, 2921420, 4089988, 5112485, 10224970, 20449940]

約数ペア:

[(1, 20449940), (2, 10224970), (4, 5112485), (5, 4089988), (7, 2921420), (10, 2044994), (14, 1460710), (20, 1022497), (28, 730355), (35, 584284), (43, 475580), (70, 292142), (79, 258860), (86, 237790), (140, 146071), (158, 129430), (172, 118895), (215, 95116), (301, 67940), (316, 64715), (395, 51772), (430, 47558), (553, 36980), (602, 33970), (790, 25886), (860, 23779), (1106, 18490), (1204, 16985), (1505, 13588), (1580, 12943), (1849, 11060), (2212, 9245), (2765, 7396), (3010, 6794), (3397, 6020), (3698, 5530)]