21221757

素因数分解:

$3^4\times {\mathrm{37}}^1\times {\mathrm{73}}^1\times {\mathrm{97}}^1$

素因数の和:219

約数の個数: 40

約数和(自身を含む): 33344696

約数和(自身を除く): 12122939

約数列:

[1, 3, 9, 27, 37, 73, 81, 97, 111, 219, 291, 333, 657, 873, 999, 1971, 2619, 2701, 2997, 3589, 5913, 7081, 7857, 8103, 10767, 21243, 24309, 32301, 63729, 72927, 96903, 191187, 218781, 261997, 290709, 573561, 785991, 2357973, 7073919, 21221757]

約数ペア:

[(1, 21221757), (3, 7073919), (9, 2357973), (27, 785991), (37, 573561), (73, 290709), (81, 261997), (97, 218781), (111, 191187), (219, 96903), (291, 72927), (333, 63729), (657, 32301), (873, 24309), (999, 21243), (1971, 10767), (2619, 8103), (2701, 7857), (2997, 7081), (3589, 5913)]