21239385

素因数分解:

$3^1\times 5^1\times {\mathrm{281}}^1\times {\mathrm{5039}}^1$

素因数の和:5328

約数の個数: 16

約数和(自身を含む): 34110720

約数和(自身を除く): 12871335

約数列:

[1, 3, 5, 15, 281, 843, 1405, 4215, 5039, 15117, 25195, 75585, 1415959, 4247877, 7079795, 21239385]

約数ペア:

[(1, 21239385), (3, 7079795), (5, 4247877), (15, 1415959), (281, 75585), (843, 25195), (1405, 15117), (4215, 5039)]