20399995

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^2\times {\mathrm{4817}}^1$

素因数の和:4851

約数の個数: 24

約数和(自身を含む): 30758112

約数和(自身を除く): 10358117

約数列:

[1, 5, 7, 11, 35, 55, 77, 121, 385, 605, 847, 4235, 4817, 24085, 33719, 52987, 168595, 264935, 370909, 582857, 1854545, 2914285, 4079999, 20399995]

約数ペア:

[(1, 20399995), (5, 4079999), (7, 2914285), (11, 1854545), (35, 582857), (55, 370909), (77, 264935), (121, 168595), (385, 52987), (605, 33719), (847, 24085), (4235, 4817)]