18110820 has 192 divisors, whose sum is σ = 65028096. Its totient is φ = 3663360.

The previous prime is 18110803. The next prime is 18110843. The reversal of 18110820 is 2801181.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 169207 + ... + 169313.

It is an arithmetic number, because the mean of its divisors is an integer number (338688).

Almost surely, 2^18110820 is an apocalyptic number.

18110820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18110820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32514048).

18110820 is an abundant number, since it is smaller than the sum of its proper divisors (46917276).

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

18110820 is a wasteful number, since it uses less digits than its factorization.

18110820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 18110820 is about 4255.6809090908. The cubic root of 18110820 is about 262.6108737979.

The spelling of 18110820 in words is "eighteen million, one hundred ten thousand, eight hundred twenty".