21156921

素因数分解:

$3^2\times {\mathrm{29}}^1\times {\mathrm{103}}^1\times {\mathrm{787}}^1$

素因数の和:925

約数の個数: 24

約数和(自身を含む): 31961280

約数和(自身を除く): 10804359

約数列:

[1, 3, 9, 29, 87, 103, 261, 309, 787, 927, 2361, 2987, 7083, 8961, 22823, 26883, 68469, 81061, 205407, 243183, 729549, 2350769, 7052307, 21156921]

約数ペア:

[(1, 21156921), (3, 7052307), (9, 2350769), (29, 729549), (87, 243183), (103, 205407), (261, 81061), (309, 68469), (787, 26883), (927, 22823), (2361, 8961), (2987, 7083)]