21258381

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{523}}^1\times {\mathrm{797}}^1$

素因数の和:1340

約数の個数: 16

約数和(自身を含む): 30106944

約数和(自身を除く): 8848563

約数列:

[1, 3, 17, 51, 523, 797, 1569, 2391, 8891, 13549, 26673, 40647, 416831, 1250493, 7086127, 21258381]

約数ペア:

[(1, 21258381), (3, 7086127), (17, 1250493), (51, 416831), (523, 40647), (797, 26673), (1569, 13549), (2391, 8891)]