21049821

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{59971}}^1$

素因数の和:59993

約数の個数: 16

約数和(自身を含む): 33584320

約数和(自身を除く): 12534499

約数列:

[1, 3, 9, 13, 27, 39, 117, 351, 59971, 179913, 539739, 779623, 1619217, 2338869, 7016607, 21049821]

約数ペア:

[(1, 21049821), (3, 7016607), (9, 2338869), (13, 1619217), (27, 779623), (39, 539739), (117, 179913), (351, 59971)]