18887020 has 24 divisors (see below), whose sum is σ = 40736304. Its totient is φ = 7350336.

The previous prime is 18887009. The next prime is 18887023. The reversal of 18887020 is 2078881.

It is a hoax number, since the sum of its digits (34) 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 (18887023) 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, 12022 + ... + 13501.

It is an arithmetic number, because the mean of its divisors is an integer number (1697346).

Almost surely, 2^18887020 is an apocalyptic number.

18887020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18887020 is an abundant number, since it is smaller than the sum of its proper divisors (21849284).

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

18887020 is a wasteful number, since it uses less digits than its factorization.

18887020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25569 (or 25567 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 18887020 is about 4345.9199256314. The cubic root of 18887020 is about 266.3102077540.

The spelling of 18887020 in words is "eighteen million, eight hundred eighty-seven thousand, twenty".