21151280

素因数分解:

$2^4\times 5^1\times {\mathrm{264391}}^1$

素因数の和:264404

約数の個数: 20

約数和(自身を含む): 49176912

約数和(自身を除く): 28025632

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264391, 528782, 1057564, 1321955, 2115128, 2643910, 4230256, 5287820, 10575640, 21151280]

約数ペア:

[(1, 21151280), (2, 10575640), (4, 5287820), (5, 4230256), (8, 2643910), (10, 2115128), (16, 1321955), (20, 1057564), (40, 528782), (80, 264391)]