81231560

素因数分解:

$2^3\times 5^1\times {\mathrm{2030789}}^1$

素因数の和:2030800

約数の個数: 16

約数和(自身を含む): 182771100

約数和(自身を除く): 101539540

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 2030789, 4061578, 8123156, 10153945, 16246312, 20307890, 40615780, 81231560]

約数ペア:

[(1, 81231560), (2, 40615780), (4, 20307890), (5, 16246312), (8, 10153945), (10, 8123156), (20, 4061578), (40, 2030789)]