20493440

素因数分解:

$2^7\times 5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1$

素因数の和:142

約数の個数: 128

約数和(自身を含む): 55520640

約数和(自身を除く): 35027200

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 32, 40, 41, 44, 55, 64, 71, 80, 82, 88, 110, 128, 142, 160, 164, 176, 205, 220, 284, 320, 328, 352, 355, 410, 440, 451, 568, 640, 656, 704, 710, 781, 820, 880, 902, 1136, 1312, 1408, 1420, 1562, 1640, 1760, 1804, 2255, 2272, 2624, 2840, 2911, 3124, 3280, 3520, 3608, 3905, 4510, 4544, 5248, 5680, 5822, 6248, 6560, 7040, 7216, 7810, 9020, 9088, 11360, 11644, 12496, 13120, 14432, 14555, 15620, 18040, 22720, 23288, 24992, 26240, 28864, 29110, 31240, 32021, 36080, 45440, 46576, 49984, 57728, 58220, 62480, 64042, 72160, 93152, 99968, 116440, 124960, 128084, 144320, 160105, 186304, 232880, 249920, 256168, 288640, 320210, 372608, 465760, 499840, 512336, 640420, 931520, 1024672, 1280840, 1863040, 2049344, 2561680, 4098688, 5123360, 10246720, 20493440]

約数ペア:

[(1, 20493440), (2, 10246720), (4, 5123360), (5, 4098688), (8, 2561680), (10, 2049344), (11, 1863040), (16, 1280840), (20, 1024672), (22, 931520), (32, 640420), (40, 512336), (41, 499840), (44, 465760), (55, 372608), (64, 320210), (71, 288640), (80, 256168), (82, 249920), (88, 232880), (110, 186304), (128, 160105), (142, 144320), (160, 128084), (164, 124960), (176, 116440), (205, 99968), (220, 93152), (284, 72160), (320, 64042), (328, 62480), (352, 58220), (355, 57728), (410, 49984), (440, 46576), (451, 45440), (568, 36080), (640, 32021), (656, 31240), (704, 29110), (710, 28864), (781, 26240), (820, 24992), (880, 23288), (902, 22720), (1136, 18040), (1312, 15620), (1408, 14555), (1420, 14432), (1562, 13120), (1640, 12496), (1760, 11644), (1804, 11360), (2255, 9088), (2272, 9020), (2624, 7810), (2840, 7216), (2911, 7040), (3124, 6560), (3280, 6248), (3520, 5822), (3608, 5680), (3905, 5248), (4510, 4544)]