20487860

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{12967}}^1$

素因数の和:13055

約数の個数: 24

約数和(自身を含む): 43572480

約数和(自身を除く): 23084620

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 12967, 25934, 51868, 64835, 129670, 259340, 1024393, 2048786, 4097572, 5121965, 10243930, 20487860]

約数ペア:

[(1, 20487860), (2, 10243930), (4, 5121965), (5, 4097572), (10, 2048786), (20, 1024393), (79, 259340), (158, 129670), (316, 64835), (395, 51868), (790, 25934), (1580, 12967)]