20999555

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{2221}}^1$

素因数の和:2318

約数の個数: 16

約数和(自身を含む): 26450688

約数和(自身を除く): 5451133

約数列:

[1, 5, 31, 61, 155, 305, 1891, 2221, 9455, 11105, 68851, 135481, 344255, 677405, 4199911, 20999555]

約数ペア:

[(1, 20999555), (5, 4199911), (31, 677405), (61, 344255), (155, 135481), (305, 68851), (1891, 11105), (2221, 9455)]