18810020

素因数分解:

$2^2\times 5^1\times {\mathrm{940501}}^1$

素因数の和:940510

約数の個数: 12

約数和(自身を含む): 39501084

約数和(自身を除く): 20691064

約数列:

[1, 2, 4, 5, 10, 20, 940501, 1881002, 3762004, 4702505, 9405010, 18810020]

約数ペア:

[(1, 18810020), (2, 9405010), (4, 4702505), (5, 3762004), (10, 1881002), (20, 940501)]