20023213157 has 2 divisors, whose sum is σ = 20023213158. Its totient is φ = 20023213156.

The previous prime is 20023213057. The next prime is 20023213159. The reversal of 20023213157 is 75131232002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17765157796 + 2258055361 = 133286^2 + 47519^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023213157 - 2²² = 20019018853 is a prime.

Together with 20023213159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20023213159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011606578 + 10011606579.

It is an arithmetic number, because the mean of its divisors is an integer number (10011606579).

Almost surely, 2^20023213157 is an apocalyptic number.

It is an amenable number.

20023213157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023213157 is an equidigital number, since it uses as much as digits as its factorization.

20023213157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

Adding to 20023213157 its reverse (75131232002), we get a palindrome (95154445159).

The spelling of 20023213157 in words is "twenty billion, twenty-three million, two hundred thirteen thousand, one hundred fifty-seven".