$4 = $ ?

$2^{2} \times 13$ $2^{2} \times 7$ $2^{2} \times 11$ $2$ $2^{2}$

$405 = $ ?

$2 \times 3^{4} \times 5$ $3^{4} \times 5$ $3^{4} \times 5 \times 19$ $3^{5} \times 5$ $3^{4} \times 5 \times 11$

$20 = $ ?

$2^{2} \times 5^{2}$ $2^{2} \times 5$ $2^{2} \times 5 \times 7$ $2^{2} \times 3 \times 5$ $2^{2} \times 5 \times 11$

$396 = $ ?

$2^{2} \times 3^{2} \times 11$ $2^{3} \times 3^{2} \times 11$ $2^{2} \times 3^{2} \times 11 \times 13$ $2^{2} \times 3^{3} \times 11$ $2^{2} \times 3^{2} \times 11^{2}$

$840 = $ ?

$2^{2} \times 3 \times 5 \times 7$ $2^{3} \times 3^{2} \times 5 \times 7$ $2 \times 3 \times 5 \times 7$ $2^{3} \times 3 \times 5 \times 7$ $2^{3} \times 3 \times 5^{2} \times 7$