18201880 has 16 divisors (see below), whose sum is σ = 40954320. Its totient is φ = 7280736.

The previous prime is 18201839. The next prime is 18201881. The reversal of 18201880 is 8810281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18201881) 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, 227484 + ... + 227563.

It is an arithmetic number, because the mean of its divisors is an integer number (2559645).

Almost surely, 2^18201880 is an apocalyptic number.

18201880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18201880 is an abundant number, since it is smaller than the sum of its proper divisors (22752440).

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

18201880 is a wasteful number, since it uses less digits than its factorization.

18201880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455058 (or 455054 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 18201880 is about 4266.3661352491. The cubic root of 18201880 is about 263.0502682134.

The spelling of 18201880 in words is "eighteen million, two hundred one thousand, eight hundred eighty".