21005215

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{54559}}^1$

素因数の和:54582

約数の個数: 16

約数和(自身を含む): 31426560

約数和(自身を除く): 10421345

約数列:

[1, 5, 7, 11, 35, 55, 77, 385, 54559, 272795, 381913, 600149, 1909565, 3000745, 4201043, 21005215]

約数ペア:

[(1, 21005215), (5, 4201043), (7, 3000745), (11, 1909565), (35, 600149), (55, 381913), (77, 272795), (385, 54559)]