21000687155

素因数分解:

$5^1\times 7^1\times {\mathrm{223}}^1\times {\mathrm{2690671}}^1$

素因数の和:2690906

約数の個数: 16

約数和(自身を含む): 28930105344

約数和(自身を除く): 7929418189

約数列:

[1, 5, 7, 35, 223, 1115, 1561, 7805, 2690671, 13453355, 18834697, 94173485, 600019633, 3000098165, 4200137431, 21000687155]

約数ペア:

[(1, 21000687155), (5, 4200137431), (7, 3000098165), (35, 600019633), (223, 94173485), (1115, 18834697), (1561, 13453355), (7805, 2690671)]