20731423 has 2 divisors, whose sum is σ = 20731424. Its totient is φ = 20731422.

The previous prime is 20731411. The next prime is 20731429. The reversal of 20731423 is 32413702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20731423 - 2⁵ = 20731391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20731394 and 20731403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20731429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365711 + 10365712.

It is an arithmetic number, because the mean of its divisors is an integer number (10365712).

Almost surely, 2^20731423 is an apocalyptic number.

20731423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20731423 is an equidigital number, since it uses as much as digits as its factorization.

20731423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20731423 is about 4553.1772423221. The cubic root of 20731423 is about 274.7112031564.

The spelling of 20731423 in words is "twenty million, seven hundred thirty-one thousand, four hundred twenty-three".