21720879

素因数分解:

$3^4\times {\mathrm{229}}^1\times {\mathrm{1171}}^1$

素因数の和:1412

約数の個数: 20

約数和(自身を含む): 32616760

約数和(自身を除く): 10895881

約数列:

[1, 3, 9, 27, 81, 229, 687, 1171, 2061, 3513, 6183, 10539, 18549, 31617, 94851, 268159, 804477, 2413431, 7240293, 21720879]

約数ペア:

[(1, 21720879), (3, 7240293), (9, 2413431), (27, 804477), (81, 268159), (229, 94851), (687, 31617), (1171, 18549), (2061, 10539), (3513, 6183)]