21538280

素因数分解:

$2^3\times 5^1\times {\mathrm{538457}}^1$

素因数の和:538468

約数の個数: 16

約数和(自身を含む): 48461220

約数和(自身を除く): 26922940

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 538457, 1076914, 2153828, 2692285, 4307656, 5384570, 10769140, 21538280]

約数ペア:

[(1, 21538280), (2, 10769140), (4, 5384570), (5, 4307656), (8, 2692285), (10, 2153828), (20, 1076914), (40, 538457)]