21186963

素因数分解:

$3^2\times 7^2\times {\mathrm{107}}^1\times {\mathrm{449}}^1$

素因数の和:576

約数の個数: 36

約数和(自身を含む): 36012600

約数和(自身を除く): 14825637

約数列:

[1, 3, 7, 9, 21, 49, 63, 107, 147, 321, 441, 449, 749, 963, 1347, 2247, 3143, 4041, 5243, 6741, 9429, 15729, 22001, 28287, 47187, 48043, 66003, 144129, 198009, 336301, 432387, 1008903, 2354107, 3026709, 7062321, 21186963]

約数ペア:

[(1, 21186963), (3, 7062321), (7, 3026709), (9, 2354107), (21, 1008903), (49, 432387), (63, 336301), (107, 198009), (147, 144129), (321, 66003), (441, 48043), (449, 47187), (749, 28287), (963, 22001), (1347, 15729), (2247, 9429), (3143, 6741), (4041, 5243)]