21920679981

素因数分解:

$3^2\times {\mathrm{19}}^1\times {\mathrm{128191111}}^1$

素因数の和:128191136

約数の個数: 12

約数和(自身を含む): 33329689120

約数和(自身を除く): 11409009139

約数列:

[1, 3, 9, 19, 57, 171, 128191111, 384573333, 1153719999, 2435631109, 7306893327, 21920679981]

約数ペア:

[(1, 21920679981), (3, 7306893327), (9, 2435631109), (19, 1153719999), (57, 384573333), (171, 128191111)]