21159784

素因数分解:

$2^3\times {\mathrm{43}}^1\times {\mathrm{61511}}^1$

素因数の和:61560

約数の個数: 16

約数和(自身を含む): 40597920

約数和(自身を除く): 19438136

約数列:

[1, 2, 4, 8, 43, 86, 172, 344, 61511, 123022, 246044, 492088, 2644973, 5289946, 10579892, 21159784]

約数ペア:

[(1, 21159784), (2, 10579892), (4, 5289946), (8, 2644973), (43, 492088), (86, 246044), (172, 123022), (344, 61511)]