21509761

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{239}}^1$

素因数の和:325

約数の個数: 32

約数和(自身を含む): 28385280

約数和(自身を除く): 6875519

約数列:

[1, 7, 13, 23, 43, 91, 161, 239, 299, 301, 559, 989, 1673, 2093, 3107, 3913, 5497, 6923, 10277, 12857, 21749, 38479, 71461, 71939, 89999, 133601, 236371, 500227, 935207, 1654597, 3072823, 21509761]

約数ペア:

[(1, 21509761), (7, 3072823), (13, 1654597), (23, 935207), (43, 500227), (91, 236371), (161, 133601), (239, 89999), (299, 71939), (301, 71461), (559, 38479), (989, 21749), (1673, 12857), (2093, 10277), (3107, 6923), (3913, 5497)]