The number of significant figures in 20400 depends on how the number is presented. If there are no decimal points, it typically has three significant figures (2, 0, and 4), while the trailing zeros are not considered significant. However, if it were written as 20,400. (with a decimal point), it would have five significant figures. Thus, context is important for determining the exact number of significant figures.
there are 3 sig figs. 4, 0, and 5 are the sig figs
5 sig figs
61 has 2 sig figs.
There are five sig figs
There are four sig figs in 2.905.
There are three sig figs in 1.05.
There are three sig figs in 4890.
All five of them are sig figs
There are two sig figs in 3700000.
There are two sig figs in 290.
There are five sig figs in 4.1275.
6.002 has four sig figs.