81591640

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1$

素因数の和:197

約数の個数: 128

約数和(自身を含む): 209563200

約数和(自身を除く): 127971560

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 41, 43, 52, 65, 82, 86, 89, 104, 130, 164, 172, 178, 205, 215, 260, 328, 344, 356, 410, 430, 445, 520, 533, 559, 712, 820, 860, 890, 1066, 1118, 1157, 1640, 1720, 1763, 1780, 2132, 2236, 2314, 2665, 2795, 3526, 3560, 3649, 3827, 4264, 4472, 4628, 5330, 5590, 5785, 7052, 7298, 7654, 8815, 9256, 10660, 11180, 11570, 14104, 14596, 15308, 17630, 18245, 19135, 21320, 22360, 22919, 23140, 29192, 30616, 35260, 36490, 38270, 45838, 46280, 47437, 49751, 70520, 72980, 76540, 91676, 94874, 99502, 114595, 145960, 153080, 156907, 183352, 189748, 199004, 229190, 237185, 248755, 313814, 379496, 398008, 458380, 474370, 497510, 627628, 784535, 916760, 948740, 995020, 1255256, 1569070, 1897480, 1990040, 2039791, 3138140, 4079582, 6276280, 8159164, 10198955, 16318328, 20397910, 40795820, 81591640]

約数ペア:

[(1, 81591640), (2, 40795820), (4, 20397910), (5, 16318328), (8, 10198955), (10, 8159164), (13, 6276280), (20, 4079582), (26, 3138140), (40, 2039791), (41, 1990040), (43, 1897480), (52, 1569070), (65, 1255256), (82, 995020), (86, 948740), (89, 916760), (104, 784535), (130, 627628), (164, 497510), (172, 474370), (178, 458380), (205, 398008), (215, 379496), (260, 313814), (328, 248755), (344, 237185), (356, 229190), (410, 199004), (430, 189748), (445, 183352), (520, 156907), (533, 153080), (559, 145960), (712, 114595), (820, 99502), (860, 94874), (890, 91676), (1066, 76540), (1118, 72980), (1157, 70520), (1640, 49751), (1720, 47437), (1763, 46280), (1780, 45838), (2132, 38270), (2236, 36490), (2314, 35260), (2665, 30616), (2795, 29192), (3526, 23140), (3560, 22919), (3649, 22360), (3827, 21320), (4264, 19135), (4472, 18245), (4628, 17630), (5330, 15308), (5590, 14596), (5785, 14104), (7052, 11570), (7298, 11180), (7654, 10660), (8815, 9256)]