81845920

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^2\times {\mathrm{109}}^1$

素因数の和:175

約数の個数: 144

約数和(自身を含む): 221787720

約数和(自身を除く): 139941800

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 19, 20, 26, 32, 38, 40, 52, 65, 76, 80, 95, 104, 109, 130, 152, 160, 190, 208, 218, 247, 260, 304, 361, 380, 416, 436, 494, 520, 545, 608, 722, 760, 872, 988, 1040, 1090, 1235, 1417, 1444, 1520, 1744, 1805, 1976, 2071, 2080, 2180, 2470, 2834, 2888, 3040, 3488, 3610, 3952, 4142, 4360, 4693, 4940, 5668, 5776, 7085, 7220, 7904, 8284, 8720, 9386, 9880, 10355, 11336, 11552, 14170, 14440, 16568, 17440, 18772, 19760, 20710, 22672, 23465, 26923, 28340, 28880, 33136, 37544, 39349, 39520, 41420, 45344, 46930, 53846, 56680, 57760, 66272, 75088, 78698, 82840, 93860, 107692, 113360, 134615, 150176, 157396, 165680, 187720, 196745, 215384, 226720, 269230, 314792, 331360, 375440, 393490, 430768, 511537, 538460, 629584, 750880, 786980, 861536, 1023074, 1076920, 1259168, 1573960, 2046148, 2153840, 2557685, 3147920, 4092296, 4307680, 5115370, 6295840, 8184592, 10230740, 16369184, 20461480, 40922960, 81845920]

約数ペア:

[(1, 81845920), (2, 40922960), (4, 20461480), (5, 16369184), (8, 10230740), (10, 8184592), (13, 6295840), (16, 5115370), (19, 4307680), (20, 4092296), (26, 3147920), (32, 2557685), (38, 2153840), (40, 2046148), (52, 1573960), (65, 1259168), (76, 1076920), (80, 1023074), (95, 861536), (104, 786980), (109, 750880), (130, 629584), (152, 538460), (160, 511537), (190, 430768), (208, 393490), (218, 375440), (247, 331360), (260, 314792), (304, 269230), (361, 226720), (380, 215384), (416, 196745), (436, 187720), (494, 165680), (520, 157396), (545, 150176), (608, 134615), (722, 113360), (760, 107692), (872, 93860), (988, 82840), (1040, 78698), (1090, 75088), (1235, 66272), (1417, 57760), (1444, 56680), (1520, 53846), (1744, 46930), (1805, 45344), (1976, 41420), (2071, 39520), (2080, 39349), (2180, 37544), (2470, 33136), (2834, 28880), (2888, 28340), (3040, 26923), (3488, 23465), (3610, 22672), (3952, 20710), (4142, 19760), (4360, 18772), (4693, 17440), (4940, 16568), (5668, 14440), (5776, 14170), (7085, 11552), (7220, 11336), (7904, 10355), (8284, 9880), (8720, 9386)]