21280240

素因数分解:

$2^4\times 5^1\times {\mathrm{266003}}^1$

素因数の和:266016

約数の個数: 20

約数和(自身を含む): 49476744

約数和(自身を除く): 28196504

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266003, 532006, 1064012, 1330015, 2128024, 2660030, 4256048, 5320060, 10640120, 21280240]

約数ペア:

[(1, 21280240), (2, 10640120), (4, 5320060), (5, 4256048), (8, 2660030), (10, 2128024), (16, 1330015), (20, 1064012), (40, 532006), (80, 266003)]