To get to the sun, it is actually not necessary to use a Δ"v" of 24 km/s. One can use 8.8 km/s to go very far away from the sun, then use a negligible Δ"v" to bring the angular momentum to zero, and then fall into the sun. This can be considered a sequence of two Hohmann transfers, one up and one down. Also, the table does not give the values that would apply when using the moon for a gravity assist. There are also possibilities of using one planet, like Venus which is the easiest to get to, to assist getting to other planets or the sun. The "Galileo" spacecraft used Venus once and Earth twice in order to reach Jupiter. The Ulysses solar probe used Jupiter to attain polar orbit around the sun.