20728221

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{97}}^1\times {\mathrm{163}}^1$

素因数の和:305

約数の個数: 32

約数和(自身を含む): 30858240

約数和(自身を除く): 10130019

約数列:

[1, 3, 19, 23, 57, 69, 97, 163, 291, 437, 489, 1311, 1843, 2231, 3097, 3749, 5529, 6693, 9291, 11247, 15811, 42389, 47433, 71231, 127167, 213693, 300409, 363653, 901227, 1090959, 6909407, 20728221]

約数ペア:

[(1, 20728221), (3, 6909407), (19, 1090959), (23, 901227), (57, 363653), (69, 300409), (97, 213693), (163, 127167), (291, 71231), (437, 47433), (489, 42389), (1311, 15811), (1843, 11247), (2231, 9291), (3097, 6693), (3749, 5529)]