18690724

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{643}}^1$

素因数の和:716

約数の個数: 36

約数和(自身を含む): 36298416

約数和(自身を除く): 17607692

約数列:

[1, 2, 4, 13, 26, 43, 52, 86, 169, 172, 338, 559, 643, 676, 1118, 1286, 2236, 2572, 7267, 8359, 14534, 16718, 27649, 29068, 33436, 55298, 108667, 110596, 217334, 359437, 434668, 718874, 1437748, 4672681, 9345362, 18690724]

約数ペア:

[(1, 18690724), (2, 9345362), (4, 4672681), (13, 1437748), (26, 718874), (43, 434668), (52, 359437), (86, 217334), (169, 110596), (172, 108667), (338, 55298), (559, 33436), (643, 29068), (676, 27649), (1118, 16718), (1286, 14534), (2236, 8359), (2572, 7267)]