20991278

素因数分解:

$2^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{4397}}^1$

素因数の和:4448

約数の個数: 32

約数和(自身を含む): 40531968

約数和(自身を除く): 19540690

約数列:

[1, 2, 7, 11, 14, 22, 31, 62, 77, 154, 217, 341, 434, 682, 2387, 4397, 4774, 8794, 30779, 48367, 61558, 96734, 136307, 272614, 338569, 677138, 954149, 1499377, 1908298, 2998754, 10495639, 20991278]

約数ペア:

[(1, 20991278), (2, 10495639), (7, 2998754), (11, 1908298), (14, 1499377), (22, 954149), (31, 677138), (62, 338569), (77, 272614), (154, 136307), (217, 96734), (341, 61558), (434, 48367), (682, 30779), (2387, 8794), (4397, 4774)]