21638547

素因数分解:

$3^2\times 7^2\times {\mathrm{139}}^1\times {\mathrm{353}}^1$

素因数の和:512

約数の個数: 36

約数和(自身を含む): 36723960

約数和(自身を除く): 15085413

約数列:

[1, 3, 7, 9, 21, 49, 63, 139, 147, 353, 417, 441, 973, 1059, 1251, 2471, 2919, 3177, 6811, 7413, 8757, 17297, 20433, 22239, 49067, 51891, 61299, 147201, 155673, 343469, 441603, 1030407, 2404283, 3091221, 7212849, 21638547]

約数ペア:

[(1, 21638547), (3, 7212849), (7, 3091221), (9, 2404283), (21, 1030407), (49, 441603), (63, 343469), (139, 155673), (147, 147201), (353, 61299), (417, 51891), (441, 49067), (973, 22239), (1059, 20433), (1251, 17297), (2471, 8757), (2919, 7413), (3177, 6811)]