19903990

素因数分解:

$2^1\times 5^1\times {\mathrm{443}}^1\times {\mathrm{4493}}^1$

素因数の和:4943

約数の個数: 16

約数和(自身を含む): 35916048

約数和(自身を除く): 16012058

約数列:

[1, 2, 5, 10, 443, 886, 2215, 4430, 4493, 8986, 22465, 44930, 1990399, 3980798, 9951995, 19903990]

約数ペア:

[(1, 19903990), (2, 9951995), (5, 3980798), (10, 1990399), (443, 44930), (886, 22465), (2215, 8986), (4430, 4493)]