18420924 has 12 divisors (see below), whose sum is σ = 42982184. Its totient is φ = 6140304.

The previous prime is 18420923. The next prime is 18420929. The reversal of 18420924 is 42902481.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 18420891 and 18420900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420923) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 767527 + ... + 767550.

Almost surely, 2^18420924 is an apocalyptic number.

It is an amenable number.

18420924 is an abundant number, since it is smaller than the sum of its proper divisors (24561260).

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

18420924 is a wasteful number, since it uses less digits than its factorization.

18420924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535084 (or 1535082 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18420924 is about 4291.9603912431. The cubic root of 18420924 is about 264.1012582186.

The spelling of 18420924 in words is "eighteen million, four hundred twenty thousand, nine hundred twenty-four".