18986990

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{1709}}^1$

素因数の和:1828

約数の個数: 32

約数和(自身を含む): 37674720

約数和(自身を除く): 18687730

約数列:

[1, 2, 5, 10, 11, 22, 55, 101, 110, 202, 505, 1010, 1111, 1709, 2222, 3418, 5555, 8545, 11110, 17090, 18799, 37598, 93995, 172609, 187990, 345218, 863045, 1726090, 1898699, 3797398, 9493495, 18986990]

約数ペア:

[(1, 18986990), (2, 9493495), (5, 3797398), (10, 1898699), (11, 1726090), (22, 863045), (55, 345218), (101, 187990), (110, 172609), (202, 93995), (505, 37598), (1010, 18799), (1111, 17090), (1709, 11110), (2222, 8545), (3418, 5555)]