21000921921

素因数分解:

$3^6\times 7^1\times {\mathrm{4115407}}^1$

素因数の和:4115432

約数の個数: 28

約数和(自身を含む): 35985127552

約数和(自身を除く): 14984205631

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 567, 729, 1701, 5103, 4115407, 12346221, 28807849, 37038663, 86423547, 111115989, 259270641, 333347967, 777811923, 1000043901, 2333435769, 3000131703, 7000307307, 21000921921]

約数ペア:

[(1, 21000921921), (3, 7000307307), (7, 3000131703), (9, 2333435769), (21, 1000043901), (27, 777811923), (63, 333347967), (81, 259270641), (189, 111115989), (243, 86423547), (567, 37038663), (729, 28807849), (1701, 12346221), (5103, 4115407)]