$$\frac{12}{1\cdot6\times10^{-19}}$$
$20000000000000000000$
$$\frac{12}{6\times 10^{-19}}$$
$$\frac{12}{6\times \frac{1}{10000000000000000000}}$$
$$\frac{12}{\frac{3}{5000000000000000000}}$$
$$12\times \frac{5000000000000000000}{3}$$
$$20000000000000000000$$
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$2^{20}\times 5^{19}$
