21493431

素因数分解:

$3^4\times {\mathrm{23}}^1\times {\mathrm{83}}^1\times {\mathrm{139}}^1$

素因数の和:257

約数の個数: 40

約数和(自身を含む): 34151040

約数和(自身を除く): 12657609

約数列:

[1, 3, 9, 23, 27, 69, 81, 83, 139, 207, 249, 417, 621, 747, 1251, 1863, 1909, 2241, 3197, 3753, 5727, 6723, 9591, 11259, 11537, 17181, 28773, 34611, 51543, 86319, 103833, 154629, 258957, 265351, 311499, 796053, 934497, 2388159, 7164477, 21493431]

約数ペア:

[(1, 21493431), (3, 7164477), (9, 2388159), (23, 934497), (27, 796053), (69, 311499), (81, 265351), (83, 258957), (139, 154629), (207, 103833), (249, 86319), (417, 51543), (621, 34611), (747, 28773), (1251, 17181), (1863, 11537), (1909, 11259), (2241, 9591), (3197, 6723), (3753, 5727)]