21545919

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{15647}}^1$

素因数の和:15676

約数の個数: 20

約数和(自身を含む): 34081344

約数和(自身を除く): 12535425

約数列:

[1, 3, 9, 17, 27, 51, 81, 153, 459, 1377, 15647, 46941, 140823, 265999, 422469, 797997, 1267407, 2393991, 7181973, 21545919]

約数ペア:

[(1, 21545919), (3, 7181973), (9, 2393991), (17, 1267407), (27, 797997), (51, 422469), (81, 265999), (153, 140823), (459, 46941), (1377, 15647)]