21259509

素因数分解:

$3^1\times {\mathrm{103}}^1\times {\mathrm{107}}^1\times {\mathrm{643}}^1$

素因数の和:856

約数の個数: 16

約数和(自身を含む): 28933632

約数和(自身を除く): 7674123

約数列:

[1, 3, 103, 107, 309, 321, 643, 1929, 11021, 33063, 66229, 68801, 198687, 206403, 7086503, 21259509]

約数ペア:

[(1, 21259509), (3, 7086503), (103, 206403), (107, 198687), (309, 68801), (321, 66229), (643, 33063), (1929, 11021)]