20888680

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{47}}^1\times {\mathrm{271}}^1$

素因数の和:370

約数の個数: 64

約数和(自身を含む): 49351680

約数和(自身を除く): 28463000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 47, 82, 94, 164, 188, 205, 235, 271, 328, 376, 410, 470, 542, 820, 940, 1084, 1355, 1640, 1880, 1927, 2168, 2710, 3854, 5420, 7708, 9635, 10840, 11111, 12737, 15416, 19270, 22222, 25474, 38540, 44444, 50948, 55555, 63685, 77080, 88888, 101896, 111110, 127370, 222220, 254740, 444440, 509480, 522217, 1044434, 2088868, 2611085, 4177736, 5222170, 10444340, 20888680]

約数ペア:

[(1, 20888680), (2, 10444340), (4, 5222170), (5, 4177736), (8, 2611085), (10, 2088868), (20, 1044434), (40, 522217), (41, 509480), (47, 444440), (82, 254740), (94, 222220), (164, 127370), (188, 111110), (205, 101896), (235, 88888), (271, 77080), (328, 63685), (376, 55555), (410, 50948), (470, 44444), (542, 38540), (820, 25474), (940, 22222), (1084, 19270), (1355, 15416), (1640, 12737), (1880, 11111), (1927, 10840), (2168, 9635), (2710, 7708), (3854, 5420)]