20505840

素因数分解:

$2^4\times 3^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{1987}}^1$

素因数の和:2046

約数の個数: 80

約数和(自身を含む): 65079168

約数和(自身を除く): 44573328

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 43, 48, 60, 80, 86, 120, 129, 172, 215, 240, 258, 344, 430, 516, 645, 688, 860, 1032, 1290, 1720, 1987, 2064, 2580, 3440, 3974, 5160, 5961, 7948, 9935, 10320, 11922, 15896, 19870, 23844, 29805, 31792, 39740, 47688, 59610, 79480, 85441, 95376, 119220, 158960, 170882, 238440, 256323, 341764, 427205, 476880, 512646, 683528, 854410, 1025292, 1281615, 1367056, 1708820, 2050584, 2563230, 3417640, 4101168, 5126460, 6835280, 10252920, 20505840]

約数ペア:

[(1, 20505840), (2, 10252920), (3, 6835280), (4, 5126460), (5, 4101168), (6, 3417640), (8, 2563230), (10, 2050584), (12, 1708820), (15, 1367056), (16, 1281615), (20, 1025292), (24, 854410), (30, 683528), (40, 512646), (43, 476880), (48, 427205), (60, 341764), (80, 256323), (86, 238440), (120, 170882), (129, 158960), (172, 119220), (215, 95376), (240, 85441), (258, 79480), (344, 59610), (430, 47688), (516, 39740), (645, 31792), (688, 29805), (860, 23844), (1032, 19870), (1290, 15896), (1720, 11922), (1987, 10320), (2064, 9935), (2580, 7948), (3440, 5961), (3974, 5160)]