21981320

素因数分解:

$2^3\times 5^1\times {\mathrm{549533}}^1$

素因数の和:549544

約数の個数: 16

約数和(自身を含む): 49458060

約数和(自身を除く): 27476740

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 549533, 1099066, 2198132, 2747665, 4396264, 5495330, 10990660, 21981320]

約数ペア:

[(1, 21981320), (2, 10990660), (4, 5495330), (5, 4396264), (8, 2747665), (10, 2198132), (20, 1099066), (40, 549533)]