20804080

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{503}}^1$

素因数の和:574

約数の個数: 80

約数和(自身を含む): 53996544

約数和(自身を除く): 33192464

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 47, 55, 80, 88, 94, 110, 176, 188, 220, 235, 376, 440, 470, 503, 517, 752, 880, 940, 1006, 1034, 1880, 2012, 2068, 2515, 2585, 3760, 4024, 4136, 5030, 5170, 5533, 8048, 8272, 10060, 10340, 11066, 20120, 20680, 22132, 23641, 27665, 40240, 41360, 44264, 47282, 55330, 88528, 94564, 110660, 118205, 189128, 221320, 236410, 260051, 378256, 442640, 472820, 520102, 945640, 1040204, 1300255, 1891280, 2080408, 2600510, 4160816, 5201020, 10402040, 20804080]

約数ペア:

[(1, 20804080), (2, 10402040), (4, 5201020), (5, 4160816), (8, 2600510), (10, 2080408), (11, 1891280), (16, 1300255), (20, 1040204), (22, 945640), (40, 520102), (44, 472820), (47, 442640), (55, 378256), (80, 260051), (88, 236410), (94, 221320), (110, 189128), (176, 118205), (188, 110660), (220, 94564), (235, 88528), (376, 55330), (440, 47282), (470, 44264), (503, 41360), (517, 40240), (752, 27665), (880, 23641), (940, 22132), (1006, 20680), (1034, 20120), (1880, 11066), (2012, 10340), (2068, 10060), (2515, 8272), (2585, 8048), (3760, 5533), (4024, 5170), (4136, 5030)]