20518640

素因数分解:

$2^4\times 5^1\times {\mathrm{256483}}^1$

素因数の和:256496

約数の個数: 20

約数和(自身を含む): 47706024

約数和(自身を除く): 27187384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 256483, 512966, 1025932, 1282415, 2051864, 2564830, 4103728, 5129660, 10259320, 20518640]

約数ペア:

[(1, 20518640), (2, 10259320), (4, 5129660), (5, 4103728), (8, 2564830), (10, 2051864), (16, 1282415), (20, 1025932), (40, 512966), (80, 256483)]