20688891

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{367}}^1$

素因数の和:455

約数の個数: 32

約数和(自身を含む): 31088640

約数和(自身を除く): 10399749

約数列:

[1, 3, 19, 23, 43, 57, 69, 129, 367, 437, 817, 989, 1101, 1311, 2451, 2967, 6973, 8441, 15781, 18791, 20919, 25323, 47343, 56373, 160379, 299839, 362963, 481137, 899517, 1088889, 6896297, 20688891]

約数ペア:

[(1, 20688891), (3, 6896297), (19, 1088889), (23, 899517), (43, 481137), (57, 362963), (69, 299839), (129, 160379), (367, 56373), (437, 47343), (817, 25323), (989, 20919), (1101, 18791), (1311, 15781), (2451, 8441), (2967, 6973)]