20123203123042 has 8 divisors (see below), whose sum is σ = 30598295159916. Its totient is φ = 9923771403072.

The previous prime is 20123203123027. The next prime is 20123203123069. The reversal of 20123203123042 is 24032130232102.

It can be written as a sum of positive squares in 2 ways, for example, as 20116220682321 + 6982440721 = 4485111^2 + 83561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20123203122998 and 20123203123016.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68915079043 + ... + 68915079334.

Almost surely, 2^{20123203123042} is an apocalyptic number.

20123203123042 is a deficient number, since it is larger than the sum of its proper divisors (10475092036874).

20123203123042 is a wasteful number, since it uses less digits than its factorization.

20123203123042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137830158452.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 20123203123042 its reverse (24032130232102), we get a palindrome (44155333355144).

The spelling of 20123203123042 in words is "twenty trillion, one hundred twenty-three billion, two hundred three million, one hundred twenty-three thousand, forty-two".