18220032 has 88 divisors (see below), whose sum is σ = 54040800. Its totient is φ = 6064128.

The previous prime is 18219989. The next prime is 18220049. The reversal of 18220032 is 23002281.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 18219987 and 18220014.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27319 + ... + 27977.

It is an arithmetic number, because the mean of its divisors is an integer number (614100).

Almost surely, 2^18220032 is an apocalyptic number.

18220032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18220032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27020400).

18220032 is an abundant number, since it is smaller than the sum of its proper divisors (35820768).

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

18220032 is an equidigital number, since it uses as much as digits as its factorization.

18220032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688 (or 664 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 18220032 is about 4268.4929424798. The cubic root of 18220032 is about 263.1376822988.

The spelling of 18220032 in words is "eighteen million, two hundred twenty thousand, thirty-two".