20665640

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12601}}^1$

素因数の和:12653

約数の個数: 32

約数和(自身を含む): 47635560

約数和(自身を除く): 26969920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12601, 25202, 50404, 63005, 100808, 126010, 252020, 504040, 516641, 1033282, 2066564, 2583205, 4133128, 5166410, 10332820, 20665640]

約数ペア:

[(1, 20665640), (2, 10332820), (4, 5166410), (5, 4133128), (8, 2583205), (10, 2066564), (20, 1033282), (40, 516641), (41, 504040), (82, 252020), (164, 126010), (205, 100808), (328, 63005), (410, 50404), (820, 25202), (1640, 12601)]