81131960

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{719}}^1$

素因数の和:781

約数の個数: 128

約数和(自身を含む): 232243200

約数和(自身を除く): 151111240

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 20, 26, 28, 31, 35, 40, 52, 56, 62, 65, 70, 91, 104, 124, 130, 140, 155, 182, 217, 248, 260, 280, 310, 364, 403, 434, 455, 520, 620, 719, 728, 806, 868, 910, 1085, 1240, 1438, 1612, 1736, 1820, 2015, 2170, 2821, 2876, 3224, 3595, 3640, 4030, 4340, 5033, 5642, 5752, 7190, 8060, 8680, 9347, 10066, 11284, 14105, 14380, 16120, 18694, 20132, 22289, 22568, 25165, 28210, 28760, 37388, 40264, 44578, 46735, 50330, 56420, 65429, 74776, 89156, 93470, 100660, 111445, 112840, 130858, 156023, 178312, 186940, 201320, 222890, 261716, 289757, 312046, 327145, 373880, 445780, 523432, 579514, 624092, 654290, 780115, 891560, 1159028, 1248184, 1308580, 1448785, 1560230, 2028299, 2318056, 2617160, 2897570, 3120460, 4056598, 5795140, 6240920, 8113196, 10141495, 11590280, 16226392, 20282990, 40565980, 81131960]

約数ペア:

[(1, 81131960), (2, 40565980), (4, 20282990), (5, 16226392), (7, 11590280), (8, 10141495), (10, 8113196), (13, 6240920), (14, 5795140), (20, 4056598), (26, 3120460), (28, 2897570), (31, 2617160), (35, 2318056), (40, 2028299), (52, 1560230), (56, 1448785), (62, 1308580), (65, 1248184), (70, 1159028), (91, 891560), (104, 780115), (124, 654290), (130, 624092), (140, 579514), (155, 523432), (182, 445780), (217, 373880), (248, 327145), (260, 312046), (280, 289757), (310, 261716), (364, 222890), (403, 201320), (434, 186940), (455, 178312), (520, 156023), (620, 130858), (719, 112840), (728, 111445), (806, 100660), (868, 93470), (910, 89156), (1085, 74776), (1240, 65429), (1438, 56420), (1612, 50330), (1736, 46735), (1820, 44578), (2015, 40264), (2170, 37388), (2821, 28760), (2876, 28210), (3224, 25165), (3595, 22568), (3640, 22289), (4030, 20132), (4340, 18694), (5033, 16120), (5642, 14380), (5752, 14105), (7190, 11284), (8060, 10066), (8680, 9347)]