20518040

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12511}}^1$

素因数の和:12563

約数の個数: 32

約数和(自身を含む): 47295360

約数和(自身を除く): 26777320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12511, 25022, 50044, 62555, 100088, 125110, 250220, 500440, 512951, 1025902, 2051804, 2564755, 4103608, 5129510, 10259020, 20518040]

約数ペア:

[(1, 20518040), (2, 10259020), (4, 5129510), (5, 4103608), (8, 2564755), (10, 2051804), (20, 1025902), (40, 512951), (41, 500440), (82, 250220), (164, 125110), (205, 100088), (328, 62555), (410, 50044), (820, 25022), (1640, 12511)]