21681569

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{101}}^1\times {\mathrm{337}}^1$

素因数の和:465

約数の個数: 24

約数和(自身を含む): 27511848

約数和(自身を除く): 5830279

約数列:

[1, 7, 13, 49, 91, 101, 337, 637, 707, 1313, 2359, 4381, 4949, 9191, 16513, 30667, 34037, 64337, 214669, 238259, 442481, 1667813, 3097367, 21681569]

約数ペア:

[(1, 21681569), (7, 3097367), (13, 1667813), (49, 442481), (91, 238259), (101, 214669), (337, 64337), (637, 34037), (707, 30667), (1313, 16513), (2359, 9191), (4381, 4949)]