20511280

素因数分解:

$2^4\times 5^1\times {\mathrm{256391}}^1$

素因数の和:256404

約数の個数: 20

約数和(自身を含む): 47688912

約数和(自身を除く): 27177632

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 256391, 512782, 1025564, 1281955, 2051128, 2563910, 4102256, 5127820, 10255640, 20511280]

約数ペア:

[(1, 20511280), (2, 10255640), (4, 5127820), (5, 4102256), (8, 2563910), (10, 2051128), (16, 1281955), (20, 1025564), (40, 512782), (80, 256391)]