18182020

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{9001}}^1$

素因数の和:9111

約数の個数: 24

約数和(自身を含む): 38564568

約数和(自身を除く): 20382548

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 9001, 18002, 36004, 45005, 90010, 180020, 909101, 1818202, 3636404, 4545505, 9091010, 18182020]

約数ペア:

[(1, 18182020), (2, 9091010), (4, 4545505), (5, 3636404), (10, 1818202), (20, 909101), (101, 180020), (202, 90010), (404, 45005), (505, 36004), (1010, 18002), (2020, 9001)]