21087891

素因数分解:

$3^3\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{101}}^1$

素因数の和:177

約数の個数: 64

約数和(自身を含む): 37209600

約数和(自身を除く): 16121709

約数列:

[1, 3, 9, 11, 19, 27, 33, 37, 57, 99, 101, 111, 171, 209, 297, 303, 333, 407, 513, 627, 703, 909, 999, 1111, 1221, 1881, 1919, 2109, 2727, 3333, 3663, 3737, 5643, 5757, 6327, 7733, 9999, 10989, 11211, 17271, 18981, 21109, 23199, 29997, 33633, 41107, 51813, 63327, 69597, 71003, 100899, 123321, 189981, 208791, 213009, 369963, 569943, 639027, 781033, 1109889, 1917081, 2343099, 7029297, 21087891]

約数ペア:

[(1, 21087891), (3, 7029297), (9, 2343099), (11, 1917081), (19, 1109889), (27, 781033), (33, 639027), (37, 569943), (57, 369963), (99, 213009), (101, 208791), (111, 189981), (171, 123321), (209, 100899), (297, 71003), (303, 69597), (333, 63327), (407, 51813), (513, 41107), (627, 33633), (703, 29997), (909, 23199), (999, 21109), (1111, 18981), (1221, 17271), (1881, 11211), (1919, 10989), (2109, 9999), (2727, 7733), (3333, 6327), (3663, 5757), (3737, 5643)]