21072879

素因数分解:

$3^4\times {\mathrm{29}}^1\times {\mathrm{8971}}^1$

素因数の和:9012

約数の個数: 20

約数和(自身を含む): 32568360

約数和(自身を除く): 11495481

約数列:

[1, 3, 9, 27, 29, 81, 87, 261, 783, 2349, 8971, 26913, 80739, 242217, 260159, 726651, 780477, 2341431, 7024293, 21072879]

約数ペア:

[(1, 21072879), (3, 7024293), (9, 2341431), (27, 780477), (29, 726651), (81, 260159), (87, 242217), (261, 80739), (783, 26913), (2349, 8971)]