21271887

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{1367}}^1$

素因数の和:1412

約数の個数: 48

約数和(自身を含む): 39836160

約数和(自身を除く): 18564273

約数列:

[1, 3, 7, 9, 13, 19, 21, 39, 57, 63, 91, 117, 133, 171, 247, 273, 399, 741, 819, 1197, 1367, 1729, 2223, 4101, 5187, 9569, 12303, 15561, 17771, 25973, 28707, 53313, 77919, 86121, 124397, 159939, 181811, 233757, 337649, 373191, 545433, 1012947, 1119573, 1636299, 2363543, 3038841, 7090629, 21271887]

約数ペア:

[(1, 21271887), (3, 7090629), (7, 3038841), (9, 2363543), (13, 1636299), (19, 1119573), (21, 1012947), (39, 545433), (57, 373191), (63, 337649), (91, 233757), (117, 181811), (133, 159939), (171, 124397), (247, 86121), (273, 77919), (399, 53313), (741, 28707), (819, 25973), (1197, 17771), (1367, 15561), (1729, 12303), (2223, 9569), (4101, 5187)]