18003920

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{499}}^1$

素因数の和:564

約数の個数: 80

約数和(自身を含む): 46872000

約数和(自身を除く): 28868080

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 41, 44, 55, 80, 82, 88, 110, 164, 176, 205, 220, 328, 410, 440, 451, 499, 656, 820, 880, 902, 998, 1640, 1804, 1996, 2255, 2495, 3280, 3608, 3992, 4510, 4990, 5489, 7216, 7984, 9020, 9980, 10978, 18040, 19960, 20459, 21956, 27445, 36080, 39920, 40918, 43912, 54890, 81836, 87824, 102295, 109780, 163672, 204590, 219560, 225049, 327344, 409180, 439120, 450098, 818360, 900196, 1125245, 1636720, 1800392, 2250490, 3600784, 4500980, 9001960, 18003920]

約数ペア:

[(1, 18003920), (2, 9001960), (4, 4500980), (5, 3600784), (8, 2250490), (10, 1800392), (11, 1636720), (16, 1125245), (20, 900196), (22, 818360), (40, 450098), (41, 439120), (44, 409180), (55, 327344), (80, 225049), (82, 219560), (88, 204590), (110, 163672), (164, 109780), (176, 102295), (205, 87824), (220, 81836), (328, 54890), (410, 43912), (440, 40918), (451, 39920), (499, 36080), (656, 27445), (820, 21956), (880, 20459), (902, 19960), (998, 18040), (1640, 10978), (1804, 9980), (1996, 9020), (2255, 7984), (2495, 7216), (3280, 5489), (3608, 4990), (3992, 4510)]