1Co 15:
The imperishable bodies will be glorious and powerful. Paul was talking about believers.
Death does not have power over the imperishable bodies.
Re 20:
Unbelievers will be resurrected to some kind of perishable body to suffer the second death.
When Jesus returns, will the dead, believers and unbelievers, be resurrected and receive imperishable bodies?
Believers will be resurrected to imperishable bodies; unbelievers, to perishable ones.
See also
Does the Bible teach conscious torment over an infinite period of time?
The KJV indicates that our (believers) bodies will be immortal, but also "incorruptible". Those words mean similar things, but are not exactly the same. Incorruptible means sinless. We will not be able to sin or have any evil thoughts at that point. I think that is a better word to use in conjunction with "immortal" than "imperishable" because "imperishable" means the same thing as "immortal", which just means to never stop existing.
So, I think unbelievers who are resurrected will have immortal (eternally existing), but not incorruptible bodies.
I think scripture is pretty clear that unbelievers will experience eternal torment. Consider this passage:
Revelation 14:9 A third angel followed them and said in a loud voice: “If anyone worships the beast and its image and receives its mark on their forehead or on their hand, 10 they, too, will drink the wine of God’s fury, which has been poured full strength into the cup of his wrath. They will be tormented with burning sulfur in the presence of the holy angels and of the Lamb. 11 And
the smoke of their torment will rise for ever and ever. There will be no rest day or night for those who worship the beast and its image, or for anyone who receives the mark of its name.” 12 This calls for patient endurance on the part of the people of God who keep his commands and remain faithful to Jesus.
While I believe that the references to "burning sulfur" and "the smoke of their torment" are figurative, I believe when it says "there will be no rest day or night" for them is meant to be taken literally. This can be a scary thing to think about. Disturbing even. People say we shouldn't try to scare people into the kingdom, but I say why not? Whatever it takes. The gospel is not just some feel good story that we should tell like a children's story. The gospel is about being saved from something and being offered eternal life instead. Saved from what? Eternal death (the second death). But, is death annihilation? Is physical death the annihilation of our bodies? Clearly not since all of the dead will be bodily resurrected. I don't believe the second death results in annihilation, either. No, it's eternal separation from the presence of God in a place figuratively called "the lake of fire".
2 Thess 1:9 and give relief to you who are troubled, and to us as well. This will happen when the Lord Jesus is revealed from heaven in blazing fire with his powerful angels. 8 He will punish those who do not know God and do not obey the gospel of our Lord Jesus. 9
They will be punished with everlasting destruction and shut out from the presence of the Lord and from the glory of his might.
If people think it is cruel and not fair for the lost to experience eternal torment, then do they think us inheriting eternal life is also not fair? It's not up to us to decide what is fair, it's up to God.
