18866837020 has 12 divisors (see below), whose sum is σ = 39620357784. Its totient is φ = 7546734800.

The previous prime is 18866837009. The next prime is 18866837027. The reversal of 18866837020 is 2073866881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18866837027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471670906 + ... + 471670945.

It is an arithmetic number, because the mean of its divisors is an integer number (3301696482).

Almost surely, 2^18866837020 is an apocalyptic number.

18866837020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18866837020 is an abundant number, since it is smaller than the sum of its proper divisors (20753520764).

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

18866837020 is a wasteful number, since it uses less digits than its factorization.

18866837020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943341860 (or 943341858 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 18866837020 in words is "eighteen billion, eight hundred sixty-six million, eight hundred thirty-seven thousand, twenty".