21980440

素因数分解:

$2^3\times 5^1\times {\mathrm{549511}}^1$

素因数の和:549522

約数の個数: 16

約数和(自身を含む): 49456080

約数和(自身を除く): 27475640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 549511, 1099022, 2198044, 2747555, 4396088, 5495110, 10990220, 21980440]

約数ペア:

[(1, 21980440), (2, 10990220), (4, 5495110), (5, 4396088), (8, 2747555), (10, 2198044), (20, 1099022), (40, 549511)]