21218949

素因数分解:

$3^3\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{727}}^1$

素因数の和:806

約数の個数: 32

約数和(自身を含む): 33546240

約数和(自身を除く): 12327291

約数列:

[1, 3, 9, 23, 27, 47, 69, 141, 207, 423, 621, 727, 1081, 1269, 2181, 3243, 6543, 9729, 16721, 19629, 29187, 34169, 50163, 102507, 150489, 307521, 451467, 785887, 922563, 2357661, 7072983, 21218949]

約数ペア:

[(1, 21218949), (3, 7072983), (9, 2357661), (23, 922563), (27, 785887), (47, 451467), (69, 307521), (141, 150489), (207, 102507), (423, 50163), (621, 34169), (727, 29187), (1081, 19629), (1269, 16721), (2181, 9729), (3243, 6543)]