18781540

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{21839}}^1$

素因数の和:21891

約数の個数: 24

約数和(自身を含む): 40360320

約数和(自身を除く): 21578780

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 860, 21839, 43678, 87356, 109195, 218390, 436780, 939077, 1878154, 3756308, 4695385, 9390770, 18781540]

約数ペア:

[(1, 18781540), (2, 9390770), (4, 4695385), (5, 3756308), (10, 1878154), (20, 939077), (43, 436780), (86, 218390), (172, 109195), (215, 87356), (430, 43678), (860, 21839)]