21256280

素因数分解:

$2^3\times 5^1\times {\mathrm{227}}^1\times {\mathrm{2341}}^1$

素因数の和:2579

約数の個数: 32

約数和(自身を含む): 48057840

約数和(自身を除く): 26801560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 227, 454, 908, 1135, 1816, 2270, 2341, 4540, 4682, 9080, 9364, 11705, 18728, 23410, 46820, 93640, 531407, 1062814, 2125628, 2657035, 4251256, 5314070, 10628140, 21256280]

約数ペア:

[(1, 21256280), (2, 10628140), (4, 5314070), (5, 4251256), (8, 2657035), (10, 2125628), (20, 1062814), (40, 531407), (227, 93640), (454, 46820), (908, 23410), (1135, 18728), (1816, 11705), (2270, 9364), (2341, 9080), (4540, 4682)]