21128204

素因数分解:

$2^2\times {\mathrm{61}}^1\times {\mathrm{131}}^1\times {\mathrm{661}}^1$

素因数の和:857

約数の個数: 24

約数和(自身を含む): 37924656

約数和(自身を除く): 16796452

約数列:

[1, 2, 4, 61, 122, 131, 244, 262, 524, 661, 1322, 2644, 7991, 15982, 31964, 40321, 80642, 86591, 161284, 173182, 346364, 5282051, 10564102, 21128204]

約数ペア:

[(1, 21128204), (2, 10564102), (4, 5282051), (61, 346364), (122, 173182), (131, 161284), (244, 86591), (262, 80642), (524, 40321), (661, 31964), (1322, 15982), (2644, 7991)]