20821680

素因数分解:

$2^4\times 3^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{239}}^1$

素因数の和:280

約数の個数: 180

約数和(自身を含む): 77182560

約数和(自身を除く): 56360880

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 15, 16, 18, 20, 22, 24, 30, 33, 36, 40, 44, 45, 48, 55, 60, 66, 72, 80, 88, 90, 99, 110, 120, 121, 132, 144, 165, 176, 180, 198, 220, 239, 240, 242, 264, 330, 360, 363, 396, 440, 478, 484, 495, 528, 605, 660, 717, 720, 726, 792, 880, 956, 968, 990, 1089, 1195, 1210, 1320, 1434, 1452, 1584, 1815, 1912, 1936, 1980, 2151, 2178, 2390, 2420, 2629, 2640, 2868, 2904, 3585, 3630, 3824, 3960, 4302, 4356, 4780, 4840, 5258, 5445, 5736, 5808, 7170, 7260, 7887, 7920, 8604, 8712, 9560, 9680, 10516, 10755, 10890, 11472, 13145, 14340, 14520, 15774, 17208, 17424, 19120, 21032, 21510, 21780, 23661, 26290, 28680, 28919, 29040, 31548, 34416, 39435, 42064, 43020, 43560, 47322, 52580, 57360, 57838, 63096, 78870, 86040, 86757, 87120, 94644, 105160, 115676, 118305, 126192, 144595, 157740, 172080, 173514, 189288, 210320, 231352, 236610, 260271, 289190, 315480, 347028, 378576, 433785, 462704, 473220, 520542, 578380, 630960, 694056, 867570, 946440, 1041084, 1156760, 1301355, 1388112, 1735140, 1892880, 2082168, 2313520, 2602710, 3470280, 4164336, 5205420, 6940560, 10410840, 20821680]

約数ペア:

[(1, 20821680), (2, 10410840), (3, 6940560), (4, 5205420), (5, 4164336), (6, 3470280), (8, 2602710), (9, 2313520), (10, 2082168), (11, 1892880), (12, 1735140), (15, 1388112), (16, 1301355), (18, 1156760), (20, 1041084), (22, 946440), (24, 867570), (30, 694056), (33, 630960), (36, 578380), (40, 520542), (44, 473220), (45, 462704), (48, 433785), (55, 378576), (60, 347028), (66, 315480), (72, 289190), (80, 260271), (88, 236610), (90, 231352), (99, 210320), (110, 189288), (120, 173514), (121, 172080), (132, 157740), (144, 144595), (165, 126192), (176, 118305), (180, 115676), (198, 105160), (220, 94644), (239, 87120), (240, 86757), (242, 86040), (264, 78870), (330, 63096), (360, 57838), (363, 57360), (396, 52580), (440, 47322), (478, 43560), (484, 43020), (495, 42064), (528, 39435), (605, 34416), (660, 31548), (717, 29040), (720, 28919), (726, 28680), (792, 26290), (880, 23661), (956, 21780), (968, 21510), (990, 21032), (1089, 19120), (1195, 17424), (1210, 17208), (1320, 15774), (1434, 14520), (1452, 14340), (1584, 13145), (1815, 11472), (1912, 10890), (1936, 10755), (1980, 10516), (2151, 9680), (2178, 9560), (2390, 8712), (2420, 8604), (2629, 7920), (2640, 7887), (2868, 7260), (2904, 7170), (3585, 5808), (3630, 5736), (3824, 5445), (3960, 5258), (4302, 4840), (4356, 4780)]