21155799

素因数分解:

$3^1\times 7^2\times {\mathrm{71}}^1\times {\mathrm{2027}}^1$

素因数の和:2115

約数の個数: 24

約数和(自身を含む): 33291648

約数和(自身を除く): 12135849

約数列:

[1, 3, 7, 21, 49, 71, 147, 213, 497, 1491, 2027, 3479, 6081, 10437, 14189, 42567, 99323, 143917, 297969, 431751, 1007419, 3022257, 7051933, 21155799]

約数ペア:

[(1, 21155799), (3, 7051933), (7, 3022257), (21, 1007419), (49, 431751), (71, 297969), (147, 143917), (213, 99323), (497, 42567), (1491, 14189), (2027, 10437), (3479, 6081)]