20515880

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{6661}}^1$

素因数の和:6690

約数の個数: 64

約数和(自身を含む): 57559680

約数和(自身を除く): 37043800

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, 6661, 13322, 26644, 33305, 46627, 53288, 66610, 73271, 93254, 133220, 146542, 186508, 233135, 266440, 293084, 366355, 373016, 466270, 512897, 586168, 732710, 932540, 1025794, 1465420, 1865080, 2051588, 2564485, 2930840, 4103176, 5128970, 10257940, 20515880]

約数ペア:

[(1, 20515880), (2, 10257940), (4, 5128970), (5, 4103176), (7, 2930840), (8, 2564485), (10, 2051588), (11, 1865080), (14, 1465420), (20, 1025794), (22, 932540), (28, 732710), (35, 586168), (40, 512897), (44, 466270), (55, 373016), (56, 366355), (70, 293084), (77, 266440), (88, 233135), (110, 186508), (140, 146542), (154, 133220), (220, 93254), (280, 73271), (308, 66610), (385, 53288), (440, 46627), (616, 33305), (770, 26644), (1540, 13322), (3080, 6661)]