21090905

素因数分解:

$5^1\times {\mathrm{11}}^2\times {\mathrm{71}}^1\times {\mathrm{491}}^1$

素因数の和:589

約数の個数: 24

約数和(自身を含む): 28268352

約数和(自身を除く): 7177447

約数列:

[1, 5, 11, 55, 71, 121, 355, 491, 605, 781, 2455, 3905, 5401, 8591, 27005, 34861, 42955, 59411, 174305, 297055, 383471, 1917355, 4218181, 21090905]

約数ペア:

[(1, 21090905), (5, 4218181), (11, 1917355), (55, 383471), (71, 297055), (121, 174305), (355, 59411), (491, 42955), (605, 34861), (781, 27005), (2455, 8591), (3905, 5401)]