Can someone double check my math on fee per byte calculation?

Ethereum’s Yellow Paper states that it costs 20 000 gas to store one 256-bit word.

8 bit = 1 byte, therefore 256-bit word = 32 bytes. 1024 bytes = 1 kilobyte, therefore 1 kilobyte costs 32 x 20,000 gas = 640,000 gas.

Median gas price = 80 Gwei x 640,000 = 51,200,000 Gwei (12-10-2021) = 0,036061Eth Converted to USD = $134,09 (12-10-2021)

Is this about accurate? 1 kb of storage on Ethereum = $134,09? Am I missing something?

Thanks!