19889900

素因数分解:

$2^2\times 5^2\times {\mathrm{198899}}^1$

素因数の和:198913

約数の個数: 18

約数和(自身を含む): 43161300

約数和(自身を除く): 23271400

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 198899, 397798, 795596, 994495, 1988990, 3977980, 4972475, 9944950, 19889900]

約数ペア:

[(1, 19889900), (2, 9944950), (4, 4972475), (5, 3977980), (10, 1988990), (20, 994495), (25, 795596), (50, 397798), (100, 198899)]