80666680

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{101}}^1\times {\mathrm{487}}^1$

素因数の和:640

約数の個数: 64

約数和(自身を含む): 188153280

約数和(自身を除く): 107486600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 101, 164, 202, 205, 328, 404, 410, 487, 505, 808, 820, 974, 1010, 1640, 1948, 2020, 2435, 3896, 4040, 4141, 4870, 8282, 9740, 16564, 19480, 19967, 20705, 33128, 39934, 41410, 49187, 79868, 82820, 98374, 99835, 159736, 165640, 196748, 199670, 245935, 393496, 399340, 491870, 798680, 983740, 1967480, 2016667, 4033334, 8066668, 10083335, 16133336, 20166670, 40333340, 80666680]

約数ペア:

[(1, 80666680), (2, 40333340), (4, 20166670), (5, 16133336), (8, 10083335), (10, 8066668), (20, 4033334), (40, 2016667), (41, 1967480), (82, 983740), (101, 798680), (164, 491870), (202, 399340), (205, 393496), (328, 245935), (404, 199670), (410, 196748), (487, 165640), (505, 159736), (808, 99835), (820, 98374), (974, 82820), (1010, 79868), (1640, 49187), (1948, 41410), (2020, 39934), (2435, 33128), (3896, 20705), (4040, 19967), (4141, 19480), (4870, 16564), (8282, 9740)]