664380020

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{328901}}^1$

素因数の和:329011

約数の個数: 24

約数和(自身を含む): 1409016168

約数和(自身を除く): 744636148

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 328901, 657802, 1315604, 1644505, 3289010, 6578020, 33219001, 66438002, 132876004, 166095005, 332190010, 664380020]

約数ペア:

[(1, 664380020), (2, 332190010), (4, 166095005), (5, 132876004), (10, 66438002), (20, 33219001), (101, 6578020), (202, 3289010), (404, 1644505), (505, 1315604), (1010, 657802), (2020, 328901)]