20805880

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8527}}^1$

素因数の和:8599

約数の個数: 32

約数和(自身を含む): 47586240

約数和(自身を除く): 26780360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8527, 17054, 34108, 42635, 68216, 85270, 170540, 341080, 520147, 1040294, 2080588, 2600735, 4161176, 5201470, 10402940, 20805880]

約数ペア:

[(1, 20805880), (2, 10402940), (4, 5201470), (5, 4161176), (8, 2600735), (10, 2080588), (20, 1040294), (40, 520147), (61, 341080), (122, 170540), (244, 85270), (305, 68216), (488, 42635), (610, 34108), (1220, 17054), (2440, 8527)]