21216940

素因数分解:

$2^2\times 5^1\times {\mathrm{823}}^1\times {\mathrm{1289}}^1$

素因数の和:2121

約数の個数: 24

約数和(自身を含む): 44644320

約数和(自身を除く): 23427380

約数列:

[1, 2, 4, 5, 10, 20, 823, 1289, 1646, 2578, 3292, 4115, 5156, 6445, 8230, 12890, 16460, 25780, 1060847, 2121694, 4243388, 5304235, 10608470, 21216940]

約数ペア:

[(1, 21216940), (2, 10608470), (4, 5304235), (5, 4243388), (10, 2121694), (20, 1060847), (823, 25780), (1289, 16460), (1646, 12890), (2578, 8230), (3292, 6445), (4115, 5156)]