18520432 has 30 divisors (see below), whose sum is σ = 41743608. Its totient is φ = 7936992.

The previous prime is 18520427. The next prime is 18520441. The reversal of 18520432 is 23402581.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18520397 and 18520406.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 11028 + ... + 12595.

Almost surely, 2^18520432 is an apocalyptic number.

It is an amenable number.

18520432 is an abundant number, since it is smaller than the sum of its proper divisors (23223176).

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

18520432 is a wasteful number, since it uses less digits than its factorization.

18520432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23645 (or 23632 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 18520432 is about 4303.5371498338. The cubic root of 18520432 is about 264.5759540684.

The spelling of 18520432 in words is "eighteen million, five hundred twenty thousand, four hundred thirty-two".