19801540

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{90007}}^1$

素因数の和:90027

約数の個数: 24

約数和(自身を含む): 45364032

約数和(自身を除く): 25562492

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 90007, 180014, 360028, 450035, 900070, 990077, 1800140, 1980154, 3960308, 4950385, 9900770, 19801540]

約数ペア:

[(1, 19801540), (2, 9900770), (4, 4950385), (5, 3960308), (10, 1980154), (11, 1800140), (20, 990077), (22, 900070), (44, 450035), (55, 360028), (110, 180014), (220, 90007)]