23. Represent the number 231 as the sum of several natural numbers so that the product of these addends also equals 231.
23. Since $231=3 \cdot 7 \cdot 11$, but $3+7+11=21$, this number can be represented as a sum of addends, the product of which is 231, as follows:

$$
231=3+7+11+\underbrace{1+1+\ldots+1}_{210 \text { ones }}
$$