128393840

素因数分解:

$2^4\times 5^1\times {\mathrm{1604923}}^1$

素因数の和:1604936

約数の個数: 20

約数和(自身を含む): 298515864

約数和(自身を除く): 170122024

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1604923, 3209846, 6419692, 8024615, 12839384, 16049230, 25678768, 32098460, 64196920, 128393840]

約数ペア:

[(1, 128393840), (2, 64196920), (4, 32098460), (5, 25678768), (8, 16049230), (10, 12839384), (16, 8024615), (20, 6419692), (40, 3209846), (80, 1604923)]