18684420 has 24 divisors (see below), whose sum is σ = 52316544. Its totient is φ = 4982496.

The previous prime is 18684409. The next prime is 18684433. The reversal of 18684420 is 2448681.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155644 + ... + 155763.

It is an arithmetic number, because the mean of its divisors is an integer number (2179856).

Almost surely, 2^18684420 is an apocalyptic number.

18684420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18684420 is an abundant number, since it is smaller than the sum of its proper divisors (33632124).

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

18684420 is a wasteful number, since it uses less digits than its factorization.

18684420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311419 (or 311417 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 18684420 is about 4322.5478597697. The cubic root of 18684420 is about 265.3545509380.

The spelling of 18684420 in words is "eighteen million, six hundred eighty-four thousand, four hundred twenty".