21781467

素因数分解:

$3^4\times {\mathrm{19}}^1\times {\mathrm{14153}}^1$

素因数の和:14184

約数の個数: 20

約数和(自身を含む): 34252680

約数和(自身を除く): 12471213

約数列:

[1, 3, 9, 19, 27, 57, 81, 171, 513, 1539, 14153, 42459, 127377, 268907, 382131, 806721, 1146393, 2420163, 7260489, 21781467]

約数ペア:

[(1, 21781467), (3, 7260489), (9, 2420163), (19, 1146393), (27, 806721), (57, 382131), (81, 268907), (171, 127377), (513, 42459), (1539, 14153)]