18481420 has 24 divisors (see below), whose sum is σ = 40499424. Its totient is φ = 7070976.

The previous prime is 18481391. The next prime is 18481427. The reversal of 18481420 is 2418481.

It is not an unprimeable number, because it can be changed into a prime (18481427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19629 + ... + 20548.

It is an arithmetic number, because the mean of its divisors is an integer number (1687476).

Almost surely, 2^18481420 is an apocalyptic number.

18481420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18481420 is an abundant number, since it is smaller than the sum of its proper divisors (22018004).

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

18481420 is a wasteful number, since it uses less digits than its factorization.

18481420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40209 (or 40207 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 18481420 is about 4299.0022098157. The cubic root of 18481420 is about 264.3900532053.

The spelling of 18481420 in words is "eighteen million, four hundred eighty-one thousand, four hundred twenty".