20806420

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{11689}}^1$

素因数の和:11787

約数の個数: 24

約数和(自身を含む): 44188200

約数和(自身を除く): 23381780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 11689, 23378, 46756, 58445, 116890, 233780, 1040321, 2080642, 4161284, 5201605, 10403210, 20806420]

約数ペア:

[(1, 20806420), (2, 10403210), (4, 5201605), (5, 4161284), (10, 2080642), (20, 1040321), (89, 233780), (178, 116890), (356, 58445), (445, 46756), (890, 23378), (1780, 11689)]