21521804

素因数分解:

$2^2\times {\mathrm{71}}^1\times {\mathrm{75781}}^1$

素因数の和:75856

約数の個数: 12

約数和(自身を含む): 38194128

約数和(自身を除く): 16672324

約数列:

[1, 2, 4, 71, 142, 284, 75781, 151562, 303124, 5380451, 10760902, 21521804]

約数ペア:

[(1, 21521804), (2, 10760902), (4, 5380451), (71, 303124), (142, 151562), (284, 75781)]