18434920 has 32 divisors (see below), whose sum is σ = 47404800. Its totient is φ = 6320448.

The previous prime is 18434879. The next prime is 18434957. The reversal of 18434920 is 2943481.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32640 + ... + 33199.

It is an arithmetic number, because the mean of its divisors is an integer number (1481400).

Almost surely, 2^18434920 is an apocalyptic number.

18434920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18434920 is an abundant number, since it is smaller than the sum of its proper divisors (28969880).

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

18434920 is a wasteful number, since it uses less digits than its factorization.

18434920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65857 (or 65853 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 18434920 is about 4293.5905720038. The cubic root of 18434920 is about 264.1681282890.

The spelling of 18434920 in words is "eighteen million, four hundred thirty-four thousand, nine hundred twenty".