21021969

素因数分解:

$3^1\times {\mathrm{43}}^1\times {\mathrm{107}}^1\times {\mathrm{1523}}^1$

素因数の和:1676

約数の個数: 16

約数和(自身を含む): 28968192

約数和(自身を除く): 7946223

約数列:

[1, 3, 43, 107, 129, 321, 1523, 4569, 4601, 13803, 65489, 162961, 196467, 488883, 7007323, 21021969]

約数ペア:

[(1, 21021969), (3, 7007323), (43, 488883), (107, 196467), (129, 162961), (321, 65489), (1523, 13803), (4569, 4601)]