18284920 has 32 divisors (see below), whose sum is σ = 41302800. Its totient is φ = 7285248.

The previous prime is 18284891. The next prime is 18284921. The reversal of 18284920 is 2948281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18284921) 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, 11536 + ... + 13024.

Almost surely, 2^18284920 is an apocalyptic number.

18284920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18284920 is an abundant number, since it is smaller than the sum of its proper divisors (23017880).

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

18284920 is a wasteful number, since it uses less digits than its factorization.

18284920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807 (or 1803 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18284920 is about 4276.0869963087. The cubic root of 18284920 is about 263.4496877609.

The spelling of 18284920 in words is "eighteen million, two hundred eighty-four thousand, nine hundred twenty".