20258217

素因数分解:

$3^2\times 7^2\times {\mathrm{71}}^1\times {\mathrm{647}}^1$

素因数の和:738

約数の個数: 36

約数和(自身を含む): 34572096

約数和(自身を除く): 14313879

約数列:

[1, 3, 7, 9, 21, 49, 63, 71, 147, 213, 441, 497, 639, 647, 1491, 1941, 3479, 4473, 4529, 5823, 10437, 13587, 31311, 31703, 40761, 45937, 95109, 137811, 285327, 321559, 413433, 964677, 2250913, 2894031, 6752739, 20258217]

約数ペア:

[(1, 20258217), (3, 6752739), (7, 2894031), (9, 2250913), (21, 964677), (49, 413433), (63, 321559), (71, 285327), (147, 137811), (213, 95109), (441, 45937), (497, 40761), (639, 31703), (647, 31311), (1491, 13587), (1941, 10437), (3479, 5823), (4473, 4529)]