21193887

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{127}}^1\times {\mathrm{389}}^1$

素因数の和:543

約数の個数: 32

約数和(自身を含む): 33546240

約数和(自身を除く): 12352353

約数列:

[1, 3, 11, 13, 33, 39, 127, 143, 381, 389, 429, 1167, 1397, 1651, 4191, 4279, 4953, 5057, 12837, 15171, 18161, 49403, 54483, 55627, 148209, 166881, 543433, 642239, 1630299, 1926717, 7064629, 21193887]

約数ペア:

[(1, 21193887), (3, 7064629), (11, 1926717), (13, 1630299), (33, 642239), (39, 543433), (127, 166881), (143, 148209), (381, 55627), (389, 54483), (429, 49403), (1167, 18161), (1397, 15171), (1651, 12837), (4191, 5057), (4279, 4953)]