18978020

素因数分解:

$2^2\times 5^1\times {\mathrm{948901}}^1$

素因数の和:948910

約数の個数: 12

約数和(自身を含む): 39853884

約数和(自身を除く): 20875864

約数列:

[1, 2, 4, 5, 10, 20, 948901, 1897802, 3795604, 4744505, 9489010, 18978020]

約数ペア:

[(1, 18978020), (2, 9489010), (4, 4744505), (5, 3795604), (10, 1897802), (20, 948901)]