21012129

素因数分解:

$3^4\times {\mathrm{149}}^1\times {\mathrm{1741}}^1$

素因数の和:1902

約数の個数: 20

約数和(自身を含む): 31617300

約数和(自身を除く): 10605171

約数列:

[1, 3, 9, 27, 81, 149, 447, 1341, 1741, 4023, 5223, 12069, 15669, 47007, 141021, 259409, 778227, 2334681, 7004043, 21012129]

約数ペア:

[(1, 21012129), (3, 7004043), (9, 2334681), (27, 778227), (81, 259409), (149, 141021), (447, 47007), (1341, 15669), (1741, 12069), (4023, 5223)]