1.5×2×2×2×2×2×2×2×2×2×2×2×2×2×2×2=49,152
The 1.5 is for size Large.
x2 is removed (hence 15 instances instead of 16) to account for iron to neutronium conversion.
÷6×5 (to account for d8 to d10) conversion = 40,960d10
This is how the neutronium golem punch was calculated.
This is in line with...