21186440

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{179}}^1\times {\mathrm{269}}^1$

素因数の和:470

約数の個数: 64

約数和(自身を含む): 52488000

約数和(自身を除く): 31301560

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 179, 220, 269, 358, 440, 538, 716, 895, 1076, 1345, 1432, 1790, 1969, 2152, 2690, 2959, 3580, 3938, 5380, 5918, 7160, 7876, 9845, 10760, 11836, 14795, 15752, 19690, 23672, 29590, 39380, 48151, 59180, 78760, 96302, 118360, 192604, 240755, 385208, 481510, 529661, 963020, 1059322, 1926040, 2118644, 2648305, 4237288, 5296610, 10593220, 21186440]

約数ペア:

[(1, 21186440), (2, 10593220), (4, 5296610), (5, 4237288), (8, 2648305), (10, 2118644), (11, 1926040), (20, 1059322), (22, 963020), (40, 529661), (44, 481510), (55, 385208), (88, 240755), (110, 192604), (179, 118360), (220, 96302), (269, 78760), (358, 59180), (440, 48151), (538, 39380), (716, 29590), (895, 23672), (1076, 19690), (1345, 15752), (1432, 14795), (1790, 11836), (1969, 10760), (2152, 9845), (2690, 7876), (2959, 7160), (3580, 5918), (3938, 5380)]