81240980

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{45641}}^1$

素因数の和:45739

約数の個数: 24

約数和(自身を含む): 172526760

約数和(自身を除く): 91285780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 45641, 91282, 182564, 228205, 456410, 912820, 4062049, 8124098, 16248196, 20310245, 40620490, 81240980]

約数ペア:

[(1, 81240980), (2, 40620490), (4, 20310245), (5, 16248196), (10, 8124098), (20, 4062049), (89, 912820), (178, 456410), (356, 228205), (445, 182564), (890, 91282), (1780, 45641)]