'Twenty,' when referring to a quantity, signifies everything, or fullness, because it is ten twice. In Genesis 18:31, 'twenty', like all numbers occurring in the Word, signifies things and states. The significance of 'twenty' can be seen in its factors, namely, ten and two.

In the Word, 'Ten,' and 'tenths,' signify remains, i.e. every good and truth which the Lord puts into a person from infancy to the end of life.

'Ten twice,' 'two tenths,' and 'twenty' signify the same thing, but in a higher degree, namely, good. Good things in triplicate signify remains, namely, the good of infancy, the good of ignorance, and the good of intelligence.

(참조: Arcana Coelestia 10222)

9641. 'And you shall make twenty boards for the dwelling-place' means good lending support to heaven in every respect and totally. This is clear from the meaning of 'the boards of the dwelling-place' as good lending support to heaven, dealt with in 9634; and from the meaning of 'twenty' as what is complete, thus what exists in every respect and totally. This is what 'twenty' means because multiple numbers have the same meaning as the simple ones of which they are the products, 5291, 5335, 5708, 7973, so that the number 'twenty' has the same meaning as ten and two which when multiplied together produce that number. For the meaning of 'ten' as that which is complete, and all, see 3107, 4638, and likewise 'two', 9103, 9166.