81356720

素因数分解:

$2^4\times 5^1\times {\mathrm{1016959}}^1$

素因数の和:1016972

約数の個数: 20

約数和(自身を含む): 189154560

約数和(自身を除く): 107797840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1016959, 2033918, 4067836, 5084795, 8135672, 10169590, 16271344, 20339180, 40678360, 81356720]

約数ペア:

[(1, 81356720), (2, 40678360), (4, 20339180), (5, 16271344), (8, 10169590), (10, 8135672), (16, 5084795), (20, 4067836), (40, 2033918), (80, 1016959)]