$$320^{5}+72a^{3}b^{2}+162ab^{4}$$
$2\left(81ab^{4}+36b^{2}a^{3}+1677721600000\right)$
$$2\left(1677721600000+36a^{3}b^{2}+81ab^{4}\right)$$
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$162ab^{4}+72b^{2}a^{3}+3355443200000$
