21872221

素因数分解:

$7^1\times {\mathrm{61}}^1\times {\mathrm{181}}^1\times {\mathrm{283}}^1$

素因数の和:532

約数の個数: 16

約数和(自身を含む): 25637248

約数和(自身を除く): 3765027

約数列:

[1, 7, 61, 181, 283, 427, 1267, 1981, 11041, 17263, 51223, 77287, 120841, 358561, 3124603, 21872221]

約数ペア:

[(1, 21872221), (7, 3124603), (61, 358561), (181, 120841), (283, 77287), (427, 51223), (1267, 17263), (1981, 11041)]