810020

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{401}}^1$

素因数の和:511

約数の個数: 24

約数和(自身を含む): 1722168

約数和(自身を除く): 912148

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 401, 404, 505, 802, 1010, 1604, 2005, 2020, 4010, 8020, 40501, 81002, 162004, 202505, 405010, 810020]

約数ペア:

[(1, 810020), (2, 405010), (4, 202505), (5, 162004), (10, 81002), (20, 40501), (101, 8020), (202, 4010), (401, 2020), (404, 2005), (505, 1604), (802, 1010)]