21236397

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{107}}^1\times {\mathrm{727}}^1$

素因数の和:857

約数の個数: 32

約数和(自身を含む): 35223552

約数和(自身を除く): 13987155

約数列:

[1, 3, 7, 13, 21, 39, 91, 107, 273, 321, 727, 749, 1391, 2181, 2247, 4173, 5089, 9451, 9737, 15267, 28353, 29211, 66157, 77789, 198471, 233367, 544523, 1011257, 1633569, 3033771, 7078799, 21236397]

約数ペア:

[(1, 21236397), (3, 7078799), (7, 3033771), (13, 1633569), (21, 1011257), (39, 544523), (91, 233367), (107, 198471), (273, 77789), (321, 66157), (727, 29211), (749, 28353), (1391, 15267), (2181, 9737), (2247, 9451), (4173, 5089)]