21810220

素因数分解:

$2^2\times 5^1\times {\mathrm{491}}^1\times {\mathrm{2221}}^1$

素因数の和:2721

約数の個数: 24

約数和(自身を含む): 45915408

約数和(自身を除く): 24105188

約数列:

[1, 2, 4, 5, 10, 20, 491, 982, 1964, 2221, 2455, 4442, 4910, 8884, 9820, 11105, 22210, 44420, 1090511, 2181022, 4362044, 5452555, 10905110, 21810220]

約数ペア:

[(1, 21810220), (2, 10905110), (4, 5452555), (5, 4362044), (10, 2181022), (20, 1090511), (491, 44420), (982, 22210), (1964, 11105), (2221, 9820), (2455, 8884), (4442, 4910)]