18220532 has 24 divisors (see below), whose sum is σ = 36832320. Its totient is φ = 7794560.

The previous prime is 18220513. The next prime is 18220561. The reversal of 18220532 is 23502281.

It is a junction number, because it is equal to n+sod(n) for n = 18220498 and 18220507.

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 7 ways as a sum of consecutive naturals, for example, 11432 + ... + 12927.

It is an arithmetic number, because the mean of its divisors is an integer number (1534680).

Almost surely, 2^18220532 is an apocalyptic number.

It is an amenable number.

18220532 is an abundant number, since it is smaller than the sum of its proper divisors (18611788).

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

18220532 is a wasteful number, since it uses less digits than its factorization.

18220532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24391 (or 24389 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 18220532 is about 4268.5515107587. The cubic root of 18220532 is about 263.1400893132.

The spelling of 18220532 in words is "eighteen million, two hundred twenty thousand, five hundred thirty-two".