199450180

素因数分解:

$2^2\times 5^1\times {\mathrm{9972509}}^1$

素因数の和:9972518

約数の個数: 12

約数和(自身を含む): 418845420

約数和(自身を除く): 219395240

約数列:

[1, 2, 4, 5, 10, 20, 9972509, 19945018, 39890036, 49862545, 99725090, 199450180]

約数ペア:

[(1, 199450180), (2, 99725090), (4, 49862545), (5, 39890036), (10, 19945018), (20, 9972509)]