21213819

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{821}}^1$

素因数の和:873

約数の個数: 40

約数和(自身を含む): 35806320

約数和(自身を除く): 14592501

約数列:

[1, 3, 9, 11, 27, 29, 33, 81, 87, 99, 261, 297, 319, 783, 821, 891, 957, 2349, 2463, 2871, 7389, 8613, 9031, 22167, 23809, 25839, 27093, 66501, 71427, 81279, 214281, 243837, 261899, 642843, 731511, 785697, 1928529, 2357091, 7071273, 21213819]

約数ペア:

[(1, 21213819), (3, 7071273), (9, 2357091), (11, 1928529), (27, 785697), (29, 731511), (33, 642843), (81, 261899), (87, 243837), (99, 214281), (261, 81279), (297, 71427), (319, 66501), (783, 27093), (821, 25839), (891, 23809), (957, 22167), (2349, 9031), (2463, 8613), (2871, 7389)]