20864780

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{109}}^1\times {\mathrm{563}}^1$

素因数の和:698

約数の個数: 48

約数和(自身を含む): 46902240

約数和(自身を除く): 26037460

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 109, 170, 218, 340, 436, 545, 563, 1090, 1126, 1853, 2180, 2252, 2815, 3706, 5630, 7412, 9265, 9571, 11260, 18530, 19142, 37060, 38284, 47855, 61367, 95710, 122734, 191420, 245468, 306835, 613670, 1043239, 1227340, 2086478, 4172956, 5216195, 10432390, 20864780]

約数ペア:

[(1, 20864780), (2, 10432390), (4, 5216195), (5, 4172956), (10, 2086478), (17, 1227340), (20, 1043239), (34, 613670), (68, 306835), (85, 245468), (109, 191420), (170, 122734), (218, 95710), (340, 61367), (436, 47855), (545, 38284), (563, 37060), (1090, 19142), (1126, 18530), (1853, 11260), (2180, 9571), (2252, 9265), (2815, 7412), (3706, 5630)]