20519440

素因数分解:

$2^4\times 5^1\times {\mathrm{256493}}^1$

素因数の和:256506

約数の個数: 20

約数和(自身を含む): 47707884

約数和(自身を除く): 27188444

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 256493, 512986, 1025972, 1282465, 2051944, 2564930, 4103888, 5129860, 10259720, 20519440]

約数ペア:

[(1, 20519440), (2, 10259720), (4, 5129860), (5, 4103888), (8, 2564930), (10, 2051944), (16, 1282465), (20, 1025972), (40, 512986), (80, 256493)]