20001123018 has 32 divisors (see below), whose sum is σ = 45072961920. Its totient is φ = 6573137760.

The previous prime is 20001123011. The next prime is 20001123047. The reversal of 20001123018 is 81032110002.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20001123011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2604555 + ... + 2612222.

It is an arithmetic number, because the mean of its divisors is an integer number (1408530060).

Almost surely, 2^20001123018 is an apocalyptic number.

20001123018 is an abundant number, since it is smaller than the sum of its proper divisors (25071838902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20001123018 is a wasteful number, since it uses less digits than its factorization.

20001123018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5216859 (or 5216853 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The spelling of 20001123018 in words is "twenty billion, one million, one hundred twenty-three thousand, eighteen".