21004907

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{53}}^1\times {\mathrm{5147}}^1$

素因数の和:5218

約数の個数: 16

約数和(自身を含む): 26687232

約数和(自身を除く): 5682325

約数列:

[1, 7, 11, 53, 77, 371, 583, 4081, 5147, 36029, 56617, 272791, 396319, 1909537, 3000701, 21004907]

約数ペア:

[(1, 21004907), (7, 3000701), (11, 1909537), (53, 396319), (77, 272791), (371, 56617), (583, 36029), (4081, 5147)]