21088821

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{3947}}^1$

素因数の和:4100

約数の個数: 16

約数和(自身を含む): 30510144

約数和(自身を除く): 9421323

約数列:

[1, 3, 13, 39, 137, 411, 1781, 3947, 5343, 11841, 51311, 153933, 540739, 1622217, 7029607, 21088821]

約数ペア:

[(1, 21088821), (3, 7029607), (13, 1622217), (39, 540739), (137, 153933), (411, 51311), (1781, 11841), (3947, 5343)]