20798687

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{317}}^1$

素因数の和:447

約数の個数: 24

約数和(自身を含む): 26391456

約数和(自身を除く): 5592769

約数列:

[1, 7, 13, 49, 91, 103, 317, 637, 721, 1339, 2219, 4121, 5047, 9373, 15533, 28847, 32651, 65611, 201929, 228557, 424463, 1599899, 2971241, 20798687]

約数ペア:

[(1, 20798687), (7, 2971241), (13, 1599899), (49, 424463), (91, 228557), (103, 201929), (317, 65611), (637, 32651), (721, 28847), (1339, 15533), (2219, 9373), (4121, 5047)]