400840

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{911}}^1$

素因数の和:933

約数の個数: 32

約数和(自身を含む): 984960

約数和(自身を除く): 584120

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 220, 440, 911, 1822, 3644, 4555, 7288, 9110, 10021, 18220, 20042, 36440, 40084, 50105, 80168, 100210, 200420, 400840]

約数ペア:

[(1, 400840), (2, 200420), (4, 100210), (5, 80168), (8, 50105), (10, 40084), (11, 36440), (20, 20042), (22, 18220), (40, 10021), (44, 9110), (55, 7288), (88, 4555), (110, 3644), (220, 1822), (440, 911)]