1280840

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1$

素因数の和:134

約数の個数: 64

約数和(自身を含む): 3265920

約数和(自身を除く): 1985080

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 41, 44, 55, 71, 82, 88, 110, 142, 164, 205, 220, 284, 328, 355, 410, 440, 451, 568, 710, 781, 820, 902, 1420, 1562, 1640, 1804, 2255, 2840, 2911, 3124, 3608, 3905, 4510, 5822, 6248, 7810, 9020, 11644, 14555, 15620, 18040, 23288, 29110, 31240, 32021, 58220, 64042, 116440, 128084, 160105, 256168, 320210, 640420, 1280840]

約数ペア:

[(1, 1280840), (2, 640420), (4, 320210), (5, 256168), (8, 160105), (10, 128084), (11, 116440), (20, 64042), (22, 58220), (40, 32021), (41, 31240), (44, 29110), (55, 23288), (71, 18040), (82, 15620), (88, 14555), (110, 11644), (142, 9020), (164, 7810), (205, 6248), (220, 5822), (284, 4510), (328, 3905), (355, 3608), (410, 3124), (440, 2911), (451, 2840), (568, 2255), (710, 1804), (781, 1640), (820, 1562), (902, 1420)]