20408420

素因数分解:

$2^2\times 5^1\times {\mathrm{103}}^1\times {\mathrm{9907}}^1$

素因数の和:10019

約数の個数: 24

約数和(自身を含む): 43278144

約数和(自身を除く): 22869724

約数列:

[1, 2, 4, 5, 10, 20, 103, 206, 412, 515, 1030, 2060, 9907, 19814, 39628, 49535, 99070, 198140, 1020421, 2040842, 4081684, 5102105, 10204210, 20408420]

約数ペア:

[(1, 20408420), (2, 10204210), (4, 5102105), (5, 4081684), (10, 2040842), (20, 1020421), (103, 198140), (206, 99070), (412, 49535), (515, 39628), (1030, 19814), (2060, 9907)]