20013223123 has 12 divisors (see below), whose sum is σ = 21300531880. Its totient is φ = 18799817472.

The previous prime is 20013223121. The next prime is 20013223129. The reversal of 20013223123 is 32132231002.

It is not a de Polignac number, because 20013223123 - 2¹ = 20013223121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20013223123.

It is not an unprimeable number, because it can be changed into a prime (20013223121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84943 + ... + 217351.

Almost surely, 2^20013223123 is an apocalyptic number.

20013223123 is a deficient number, since it is larger than the sum of its proper divisors (1287308757).

20013223123 is a wasteful number, since it uses less digits than its factorization.

20013223123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132966 (or 132949 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20013223123 its reverse (32132231002), we get a palindrome (52145454125).

The spelling of 20013223123 in words is "twenty billion, thirteen million, two hundred twenty-three thousand, one hundred twenty-three".