20617960

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{997}}^1$

素因数の和:1066

約数の個数: 64

約数和(自身を含む): 51736320

約数和(自身を除く): 31118360

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 47, 55, 88, 94, 110, 188, 220, 235, 376, 440, 470, 517, 940, 997, 1034, 1880, 1994, 2068, 2585, 3988, 4136, 4985, 5170, 7976, 9970, 10340, 10967, 19940, 20680, 21934, 39880, 43868, 46859, 54835, 87736, 93718, 109670, 187436, 219340, 234295, 374872, 438680, 468590, 515449, 937180, 1030898, 1874360, 2061796, 2577245, 4123592, 5154490, 10308980, 20617960]

約数ペア:

[(1, 20617960), (2, 10308980), (4, 5154490), (5, 4123592), (8, 2577245), (10, 2061796), (11, 1874360), (20, 1030898), (22, 937180), (40, 515449), (44, 468590), (47, 438680), (55, 374872), (88, 234295), (94, 219340), (110, 187436), (188, 109670), (220, 93718), (235, 87736), (376, 54835), (440, 46859), (470, 43868), (517, 39880), (940, 21934), (997, 20680), (1034, 19940), (1880, 10967), (1994, 10340), (2068, 9970), (2585, 7976), (3988, 5170), (4136, 4985)]