21307385

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{12497}}^1$

素因数の和:12544

約数の個数: 16

約数和(自身を含む): 28795392

約数和(自身を除く): 7488007

約数列:

[1, 5, 11, 31, 55, 155, 341, 1705, 12497, 62485, 137467, 387407, 687335, 1937035, 4261477, 21307385]

約数ペア:

[(1, 21307385), (5, 4261477), (11, 1937035), (31, 687335), (55, 387407), (155, 137467), (341, 62485), (1705, 12497)]