21728169

素因数分解:

$3^4\times {\mathrm{23}}^1\times {\mathrm{107}}^1\times {\mathrm{109}}^1$

素因数の和:251

約数の個数: 40

約数和(自身を含む): 34499520

約数和(自身を除く): 12771351

約数列:

[1, 3, 9, 23, 27, 69, 81, 107, 109, 207, 321, 327, 621, 963, 981, 1863, 2461, 2507, 2889, 2943, 7383, 7521, 8667, 8829, 11663, 22149, 22563, 34989, 66447, 67689, 104967, 199341, 203067, 268249, 314901, 804747, 944703, 2414241, 7242723, 21728169]

約数ペア:

[(1, 21728169), (3, 7242723), (9, 2414241), (23, 944703), (27, 804747), (69, 314901), (81, 268249), (107, 203067), (109, 199341), (207, 104967), (321, 67689), (327, 66447), (621, 34989), (963, 22563), (981, 22149), (1863, 11663), (2461, 8829), (2507, 8667), (2889, 7521), (2943, 7383)]