21215709

素因数分解:

$3^3\times {\mathrm{139}}^1\times {\mathrm{5653}}^1$

素因数の和:5801

約数の個数: 16

約数和(自身を含む): 31662400

約数和(自身を除く): 10446691

約数列:

[1, 3, 9, 27, 139, 417, 1251, 3753, 5653, 16959, 50877, 152631, 785767, 2357301, 7071903, 21215709]

約数ペア:

[(1, 21215709), (3, 7071903), (9, 2357301), (27, 785767), (139, 152631), (417, 50877), (1251, 16959), (3753, 5653)]