20989647

素因数分解:

$3^2\times 7^1\times {\mathrm{211}}^1\times {\mathrm{1579}}^1$

素因数の和:1803

約数の個数: 24

約数和(自身を含む): 34835840

約数和(自身を除く): 13846193

約数列:

[1, 3, 7, 9, 21, 63, 211, 633, 1477, 1579, 1899, 4431, 4737, 11053, 13293, 14211, 33159, 99477, 333169, 999507, 2332183, 2998521, 6996549, 20989647]

約数ペア:

[(1, 20989647), (3, 6996549), (7, 2998521), (9, 2332183), (21, 999507), (63, 333169), (211, 99477), (633, 33159), (1477, 14211), (1579, 13293), (1899, 11053), (4431, 4737)]