18991679

素因数分解:

$7^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1\times {\mathrm{563}}^1$

素因数の和:710

約数の個数: 16

約数和(自身を含む): 22379520

約数和(自身を除く): 3387841

約数列:

[1, 7, 61, 79, 427, 553, 563, 3941, 4819, 33733, 34343, 44477, 240401, 311339, 2713097, 18991679]

約数ペア:

[(1, 18991679), (7, 2713097), (61, 311339), (79, 240401), (427, 44477), (553, 34343), (563, 33733), (3941, 4819)]