20406729

素因数分解:

$3^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{6991}}^1$

素因数の和:7140

約数の個数: 16

約数和(自身を含む): 31324160

約数和(自身を除く): 10917431

約数列:

[1, 3, 7, 21, 139, 417, 973, 2919, 6991, 20973, 48937, 146811, 971749, 2915247, 6802243, 20406729]

約数ペア:

[(1, 20406729), (3, 6802243), (7, 2915247), (21, 971749), (139, 146811), (417, 48937), (973, 20973), (2919, 6991)]