199900180

素因数分解:

$2^2\times 5^1\times {\mathrm{9995009}}^1$

素因数の和:9995018

約数の個数: 12

約数和(自身を含む): 419790420

約数和(自身を除く): 219890240

約数列:

[1, 2, 4, 5, 10, 20, 9995009, 19990018, 39980036, 49975045, 99950090, 199900180]

約数ペア:

[(1, 199900180), (2, 99950090), (4, 49975045), (5, 39980036), (10, 19990018), (20, 9995009)]