18689020 has 24 divisors (see below), whose sum is σ = 44853984. Its totient is φ = 6407616.

The previous prime is 18689003. The next prime is 18689023. The reversal of 18689020 is 2098681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18689023) 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, 66607 + ... + 66886.

It is an arithmetic number, because the mean of its divisors is an integer number (1868916).

Almost surely, 2^18689020 is an apocalyptic number.

18689020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18689020 is an abundant number, since it is smaller than the sum of its proper divisors (26164964).

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

18689020 is a wasteful number, since it uses less digits than its factorization.

18689020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133509 (or 133507 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18689020 is about 4323.0799206122. The cubic root of 18689020 is about 265.3763254214.

The spelling of 18689020 in words is "eighteen million, six hundred eighty-nine thousand, twenty".