21197020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81527}}^1$

素因数の和:81549

約数の個数: 24

約数和(自身を含む): 47938464

約数和(自身を除く): 26741444

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81527, 163054, 326108, 407635, 815270, 1059851, 1630540, 2119702, 4239404, 5299255, 10598510, 21197020]

約数ペア:

[(1, 21197020), (2, 10598510), (4, 5299255), (5, 4239404), (10, 2119702), (13, 1630540), (20, 1059851), (26, 815270), (52, 407635), (65, 326108), (130, 163054), (260, 81527)]