21381789

素因数分解:

$3^1\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{197}}^1$

素因数の和:258

約数の個数: 48

約数和(自身を含む): 35392896

約数和(自身を除く): 14011107

約数列:

[1, 3, 11, 13, 23, 33, 39, 69, 121, 143, 197, 253, 299, 363, 429, 591, 759, 897, 1573, 2167, 2561, 2783, 3289, 4531, 4719, 6501, 7683, 8349, 9867, 13593, 23837, 28171, 36179, 49841, 58903, 71511, 84513, 108537, 149523, 176709, 309881, 548251, 647933, 929643, 1644753, 1943799, 7127263, 21381789]

約数ペア:

[(1, 21381789), (3, 7127263), (11, 1943799), (13, 1644753), (23, 929643), (33, 647933), (39, 548251), (69, 309881), (121, 176709), (143, 149523), (197, 108537), (253, 84513), (299, 71511), (363, 58903), (429, 49841), (591, 36179), (759, 28171), (897, 23837), (1573, 13593), (2167, 9867), (2561, 8349), (2783, 7683), (3289, 6501), (4531, 4719)]