21139989

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{607}}^1$

素因数の和:689

約数の個数: 32

約数和(自身を含む): 32686080

約数和(自身を除く): 11546091

約数列:

[1, 3, 13, 19, 39, 47, 57, 141, 247, 607, 611, 741, 893, 1821, 1833, 2679, 7891, 11533, 11609, 23673, 28529, 34599, 34827, 85587, 149929, 370877, 449787, 542051, 1112631, 1626153, 7046663, 21139989]

約数ペア:

[(1, 21139989), (3, 7046663), (13, 1626153), (19, 1112631), (39, 542051), (47, 449787), (57, 370877), (141, 149929), (247, 85587), (607, 34827), (611, 34599), (741, 28529), (893, 23673), (1821, 11609), (1833, 11533), (2679, 7891)]