20721961

素因数分解:

${\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{67}}^1\times {\mathrm{643}}^1$

素因数の和:760

約数の個数: 16

約数和(自身を含む): 23297344

約数和(自身を除く): 2575383

約数列:

[1, 13, 37, 67, 481, 643, 871, 2479, 8359, 23791, 32227, 43081, 309283, 560053, 1593997, 20721961]

約数ペア:

[(1, 20721961), (13, 1593997), (37, 560053), (67, 309283), (481, 43081), (643, 32227), (871, 23791), (2479, 8359)]