18701920 has 48 divisors (see below), whose sum is σ = 44498160. Its totient is φ = 7427584.

The previous prime is 18701899. The next prime is 18701923. The reversal of 18701920 is 2910781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18701923) 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, 28314 + ... + 28966.

It is an arithmetic number, because the mean of its divisors is an integer number (927045).

Almost surely, 2^18701920 is an apocalyptic number.

18701920 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 18701920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22249080).

18701920 is an abundant number, since it is smaller than the sum of its proper divisors (25796240).

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

18701920 is a wasteful number, since it uses less digits than its factorization.

18701920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 18701920 is about 4324.5716550891. The cubic root of 18701920 is about 265.4373695933.

The spelling of 18701920 in words is "eighteen million, seven hundred one thousand, nine hundred twenty".