21278894

素因数分解:

$2^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{2719}}^1$

素因数の和:2784

約数の個数: 32

約数和(自身を含む): 40212480

約数和(自身を除く): 18933586

約数列:

[1, 2, 7, 13, 14, 26, 43, 86, 91, 182, 301, 559, 602, 1118, 2719, 3913, 5438, 7826, 19033, 35347, 38066, 70694, 116917, 233834, 247429, 494858, 818419, 1519921, 1636838, 3039842, 10639447, 21278894]

約数ペア:

[(1, 21278894), (2, 10639447), (7, 3039842), (13, 1636838), (14, 1519921), (26, 818419), (43, 494858), (86, 247429), (91, 233834), (182, 116917), (301, 70694), (559, 38066), (602, 35347), (1118, 19033), (2719, 7826), (3913, 5438)]