20865845

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{379}}^1$

素因数の和:426

約数の個数: 48

約数和(自身を含む): 33962880

約数和(自身を除く): 13097035

約数列:

[1, 5, 7, 11, 13, 35, 55, 65, 77, 91, 121, 143, 379, 385, 455, 605, 715, 847, 1001, 1573, 1895, 2653, 4169, 4235, 4927, 5005, 7865, 11011, 13265, 20845, 24635, 29183, 34489, 45859, 54197, 55055, 145915, 172445, 229295, 270985, 321013, 379379, 596167, 1605065, 1896895, 2980835, 4173169, 20865845]

約数ペア:

[(1, 20865845), (5, 4173169), (7, 2980835), (11, 1896895), (13, 1605065), (35, 596167), (55, 379379), (65, 321013), (77, 270985), (91, 229295), (121, 172445), (143, 145915), (379, 55055), (385, 54197), (455, 45859), (605, 34489), (715, 29183), (847, 24635), (1001, 20845), (1573, 13265), (1895, 11011), (2653, 7865), (4169, 5005), (4235, 4927)]