21217989

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{32003}}^1$

素因数の和:32036

約数の個数: 16

約数和(自身を含む): 32260032

約数和(自身を除く): 11042043

約数列:

[1, 3, 13, 17, 39, 51, 221, 663, 32003, 96009, 416039, 544051, 1248117, 1632153, 7072663, 21217989]

約数ペア:

[(1, 21217989), (3, 7072663), (13, 1632153), (17, 1248117), (39, 544051), (51, 416039), (221, 96009), (663, 32003)]