21253001

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{73}}^1\times {\mathrm{199}}^1$

素因数の和:309

約数の個数: 32

約数和(自身を含む): 28416000

約数和(自身を除く): 7162999

約数列:

[1, 7, 11, 19, 73, 77, 133, 199, 209, 511, 803, 1387, 1393, 1463, 2189, 3781, 5621, 9709, 14527, 15257, 15323, 26467, 41591, 101689, 106799, 159797, 276013, 291137, 1118579, 1932091, 3036143, 21253001]

約数ペア:

[(1, 21253001), (7, 3036143), (11, 1932091), (19, 1118579), (73, 291137), (77, 276013), (133, 159797), (199, 106799), (209, 101689), (511, 41591), (803, 26467), (1387, 15323), (1393, 15257), (1463, 14527), (2189, 9709), (3781, 5621)]