20601680

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{571}}^1$

素因数の和:636

約数の個数: 80

約数和(自身を含む): 53621568

約数和(自身を除く): 33019888

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 41, 44, 55, 80, 82, 88, 110, 164, 176, 205, 220, 328, 410, 440, 451, 571, 656, 820, 880, 902, 1142, 1640, 1804, 2255, 2284, 2855, 3280, 3608, 4510, 4568, 5710, 6281, 7216, 9020, 9136, 11420, 12562, 18040, 22840, 23411, 25124, 31405, 36080, 45680, 46822, 50248, 62810, 93644, 100496, 117055, 125620, 187288, 234110, 251240, 257521, 374576, 468220, 502480, 515042, 936440, 1030084, 1287605, 1872880, 2060168, 2575210, 4120336, 5150420, 10300840, 20601680]

約数ペア:

[(1, 20601680), (2, 10300840), (4, 5150420), (5, 4120336), (8, 2575210), (10, 2060168), (11, 1872880), (16, 1287605), (20, 1030084), (22, 936440), (40, 515042), (41, 502480), (44, 468220), (55, 374576), (80, 257521), (82, 251240), (88, 234110), (110, 187288), (164, 125620), (176, 117055), (205, 100496), (220, 93644), (328, 62810), (410, 50248), (440, 46822), (451, 45680), (571, 36080), (656, 31405), (820, 25124), (880, 23411), (902, 22840), (1142, 18040), (1640, 12562), (1804, 11420), (2255, 9136), (2284, 9020), (2855, 7216), (3280, 6281), (3608, 5710), (4510, 4568)]