21180225820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{311}}^1\times {\mathrm{20149}}^1$

素因数の和:20495

約数の個数: 72

約数和(自身を含む): 48320344800

約数和(自身を除く): 27140118980

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 169, 260, 311, 338, 622, 676, 845, 1244, 1555, 1690, 3110, 3380, 4043, 6220, 8086, 16172, 20149, 20215, 40298, 40430, 52559, 80596, 80860, 100745, 105118, 201490, 210236, 261937, 262795, 402980, 523874, 525590, 1047748, 1051180, 1309685, 2619370, 3405181, 5238740, 6266339, 6810362, 12532678, 13620724, 17025905, 25065356, 31331695, 34051810, 62663390, 68103620, 81462407, 125326780, 162924814, 325849628, 407312035, 814624070, 1059011291, 1629248140, 2118022582, 4236045164, 5295056455, 10590112910, 21180225820]

約数ペア:

[(1, 21180225820), (2, 10590112910), (4, 5295056455), (5, 4236045164), (10, 2118022582), (13, 1629248140), (20, 1059011291), (26, 814624070), (52, 407312035), (65, 325849628), (130, 162924814), (169, 125326780), (260, 81462407), (311, 68103620), (338, 62663390), (622, 34051810), (676, 31331695), (845, 25065356), (1244, 17025905), (1555, 13620724), (1690, 12532678), (3110, 6810362), (3380, 6266339), (4043, 5238740), (6220, 3405181), (8086, 2619370), (16172, 1309685), (20149, 1051180), (20215, 1047748), (40298, 525590), (40430, 523874), (52559, 402980), (80596, 262795), (80860, 261937), (100745, 210236), (105118, 201490)]