20639905

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{28867}}^1$

素因数の和:28896

約数の個数: 16

約数和(自身を含む): 29098944

約数和(自身を除く): 8459039

約数列:

[1, 5, 11, 13, 55, 65, 143, 715, 28867, 144335, 317537, 375271, 1587685, 1876355, 4127981, 20639905]

約数ペア:

[(1, 20639905), (5, 4127981), (11, 1876355), (13, 1587685), (55, 375271), (65, 317537), (143, 144335), (715, 28867)]