20986.00000000

素因数分解:

$2^1\times 5^1\times {\mathrm{661}}^1\times {\mathrm{1579}}^1$

素因数の和:2247

約数の個数: 16

約数和(自身を含む): 18827280

約数和(自身を除く): 8390090

約数列:

[1, 2, 5, 10, 661, 1322, 1579, 3158, 3305, 6610, 7895, 15790, 1043719, 2087438, 5218595, 10437190]

約数ペア:

[(1, 10437190), (2, 5218595), (5, 2087438), (10, 1043719), (661, 15790), (1322, 7895), (1579, 6610), (3158, 3305)]