18038163820 has 24 divisors (see below), whose sum is σ = 40108388544. Its totient is φ = 6790838016.

The previous prime is 18038163811. The next prime is 18038163827. The reversal of 18038163820 is 2836183081.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18038163827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26526372 + ... + 26527051.

It is an arithmetic number, because the mean of its divisors is an integer number (1671182856).

Almost surely, 2^18038163820 is an apocalyptic number.

18038163820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18038163820 is an abundant number, since it is smaller than the sum of its proper divisors (22070224724).

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

18038163820 is a wasteful number, since it uses less digits than its factorization.

18038163820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53053449 (or 53053447 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 18038163820 in words is "eighteen billion, thirty-eight million, one hundred sixty-three thousand, eight hundred twenty".