81515920

素因数分解:

$2^4\times 5^1\times {\mathrm{1018949}}^1$

素因数の和:1018962

約数の個数: 20

約数和(自身を含む): 189524700

約数和(自身を除く): 108008780

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1018949, 2037898, 4075796, 5094745, 8151592, 10189490, 16303184, 20378980, 40757960, 81515920]

約数ペア:

[(1, 81515920), (2, 40757960), (4, 20378980), (5, 16303184), (8, 10189490), (10, 8151592), (16, 5094745), (20, 4075796), (40, 2037898), (80, 1018949)]