21678921

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{839}}^1$

素因数の和:891

約数の個数: 40

約数和(自身を含む): 36590400

約数和(自身を除く): 14911479

約数列:

[1, 3, 9, 11, 27, 29, 33, 81, 87, 99, 261, 297, 319, 783, 839, 891, 957, 2349, 2517, 2871, 7551, 8613, 9229, 22653, 24331, 25839, 27687, 67959, 72993, 83061, 218979, 249183, 267641, 656937, 747549, 802923, 1970811, 2408769, 7226307, 21678921]

約数ペア:

[(1, 21678921), (3, 7226307), (9, 2408769), (11, 1970811), (27, 802923), (29, 747549), (33, 656937), (81, 267641), (87, 249183), (99, 218979), (261, 83061), (297, 72993), (319, 67959), (783, 27687), (839, 25839), (891, 24331), (957, 22653), (2349, 9229), (2517, 8613), (2871, 7551)]