21285880

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{6911}}^1$

素因数の和:6940

約数の個数: 64

約数和(自身を含む): 59719680

約数和(自身を除く): 38433800

約数列:

[1, 2, 4, 5, 7, 8, 10, 11, 14, 20, 22, 28, 35, 40, 44, 55, 56, 70, 77, 88, 110, 140, 154, 220, 280, 308, 385, 440, 616, 770, 1540, 3080, 6911, 13822, 27644, 34555, 48377, 55288, 69110, 76021, 96754, 138220, 152042, 193508, 241885, 276440, 304084, 380105, 387016, 483770, 532147, 608168, 760210, 967540, 1064294, 1520420, 1935080, 2128588, 2660735, 3040840, 4257176, 5321470, 10642940, 21285880]

約数ペア:

[(1, 21285880), (2, 10642940), (4, 5321470), (5, 4257176), (7, 3040840), (8, 2660735), (10, 2128588), (11, 1935080), (14, 1520420), (20, 1064294), (22, 967540), (28, 760210), (35, 608168), (40, 532147), (44, 483770), (55, 387016), (56, 380105), (70, 304084), (77, 276440), (88, 241885), (110, 193508), (140, 152042), (154, 138220), (220, 96754), (280, 76021), (308, 69110), (385, 55288), (440, 48377), (616, 34555), (770, 27644), (1540, 13822), (3080, 6911)]