20971951

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{73}}^1$

素因数の和:152

約数の個数: 48

約数和(自身を含む): 29762208

約数和(自身を除く): 8790257

約数列:

[1, 7, 11, 13, 41, 49, 73, 77, 91, 143, 287, 451, 511, 533, 539, 637, 803, 949, 1001, 2009, 2993, 3157, 3577, 3731, 5621, 5863, 6643, 7007, 10439, 20951, 22099, 26117, 32923, 38909, 39347, 41041, 46501, 73073, 146657, 230461, 272363, 287287, 427999, 511511, 1613227, 1906541, 2995993, 20971951]

約数ペア:

[(1, 20971951), (7, 2995993), (11, 1906541), (13, 1613227), (41, 511511), (49, 427999), (73, 287287), (77, 272363), (91, 230461), (143, 146657), (287, 73073), (451, 46501), (511, 41041), (533, 39347), (539, 38909), (637, 32923), (803, 26117), (949, 22099), (1001, 20951), (2009, 10439), (2993, 7007), (3157, 6643), (3577, 5863), (3731, 5621)]