21028221

素因数分解:

$3^3\times {\mathrm{149}}^1\times {\mathrm{5227}}^1$

素因数の和:5385

約数の個数: 16

約数和(自身を含む): 31368000

約数和(自身を除く): 10339779

約数列:

[1, 3, 9, 27, 149, 447, 1341, 4023, 5227, 15681, 47043, 141129, 778823, 2336469, 7009407, 21028221]

約数ペア:

[(1, 21028221), (3, 7009407), (9, 2336469), (27, 778823), (149, 141129), (447, 47043), (1341, 15681), (4023, 5227)]