648999020

素因数分解:

$2^2\times 5^1\times {\mathrm{2531}}^1\times {\mathrm{12821}}^1$

素因数の和:15361

約数の個数: 24

約数和(自身を含む): 1363542768

約数和(自身を除く): 714543748

約数列:

[1, 2, 4, 5, 10, 20, 2531, 5062, 10124, 12655, 12821, 25310, 25642, 50620, 51284, 64105, 128210, 256420, 32449951, 64899902, 129799804, 162249755, 324499510, 648999020]

約数ペア:

[(1, 648999020), (2, 324499510), (4, 162249755), (5, 129799804), (10, 64899902), (20, 32449951), (2531, 256420), (5062, 128210), (10124, 64105), (12655, 51284), (12821, 50620), (25310, 25642)]