20781279

素因数分解:

$3^4\times {\mathrm{173}}^1\times {\mathrm{1483}}^1$

素因数の和:1668

約数の個数: 20

約数和(自身を含む): 31244136

約数和(自身を除く): 10462857

約数列:

[1, 3, 9, 27, 81, 173, 519, 1483, 1557, 4449, 4671, 13347, 14013, 40041, 120123, 256559, 769677, 2309031, 6927093, 20781279]

約数ペア:

[(1, 20781279), (3, 6927093), (9, 2309031), (27, 769677), (81, 256559), (173, 120123), (519, 40041), (1483, 14013), (1557, 13347), (4449, 4671)]