20396680

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12437}}^1$

素因数の和:12489

約数の個数: 32

約数和(自身を含む): 47015640

約数和(自身を除く): 26618960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12437, 24874, 49748, 62185, 99496, 124370, 248740, 497480, 509917, 1019834, 2039668, 2549585, 4079336, 5099170, 10198340, 20396680]

約数ペア:

[(1, 20396680), (2, 10198340), (4, 5099170), (5, 4079336), (8, 2549585), (10, 2039668), (20, 1019834), (40, 509917), (41, 497480), (82, 248740), (164, 124370), (205, 99496), (328, 62185), (410, 49748), (820, 24874), (1640, 12437)]