The question cannot be answered sensibly.
25000 m3 is a measure of volume, not of mass. That volume of lead, for example, will have quite a different mass to the same volume of air. In addition to the volume, you need to know the density of the substance involved.
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27262.8 m3
Density (kg/m3) = mass(kg)/volume(m3)= 0.386/20x10-3 = 19.333333....kg/m3
The least possible number that can be rounded off to 25000 is 24995.
density= mass/volume (mass divided by volume) mass is usually in grams(g) or kilograms(kg) volume is in meters cubed or m3 so density would be either g/m3 or kg/m3
density = mass / volume density = 0.250 kg / (0.05 m)3 density = 0.250 kg / 0.000125 m3 density = 2000 kg/m3 (For comparison, pure water's density is about 1000 kg/m3)