20123203157 has 2 divisors, whose sum is σ = 20123203158. Its totient is φ = 20123203156.

The previous prime is 20123203123. The next prime is 20123203159. The reversal of 20123203157 is 75130232102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20063589316 + 59613841 = 141646^2 + 7721^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123203157 - 2²⁶ = 20056094293 is a prime.

Together with 20123203159, 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 (20123203159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061601578 + 10061601579.

It is an arithmetic number, because the mean of its divisors is an integer number (10061601579).

Almost surely, 2^20123203157 is an apocalyptic number.

It is an amenable number.

20123203157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123203157 is an equidigital number, since it uses as much as digits as its factorization.

20123203157 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 20123203157 its reverse (75130232102), we get a palindrome (95253435259).

The spelling of 20123203157 in words is "twenty billion, one hundred twenty-three million, two hundred three thousand, one hundred fifty-seven".