20789615

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^2\times {\mathrm{4909}}^1$

素因数の和:4943

約数の個数: 24

約数和(自身を含む): 31345440

約数和(自身を除く): 10555825

約数列:

[1, 5, 7, 11, 35, 55, 77, 121, 385, 605, 847, 4235, 4909, 24545, 34363, 53999, 171815, 269995, 377993, 593989, 1889965, 2969945, 4157923, 20789615]

約数ペア:

[(1, 20789615), (5, 4157923), (7, 2969945), (11, 1889965), (35, 593989), (55, 377993), (77, 269995), (121, 171815), (385, 53999), (605, 34363), (847, 24545), (4235, 4909)]