18202320 has 150 divisors (see below), whose sum is σ = 64434678. Its totient is φ = 4762368.

The previous prime is 18202313. The next prime is 18202333. The reversal of 18202320 is 2320281.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4981824 + 13220496 = 2232^2 + 3636^2 .

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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 = 18202293 and 18202302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 343414 + ... + 343466.

Almost surely, 2^18202320 is an apocalyptic number.

18202320 is a gapful number since it is divisible by the number (10) 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 18202320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32217339).

18202320 is an abundant number, since it is smaller than the sum of its proper divisors (46232358).

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

18202320 is an equidigital number, since it uses as much as digits as its factorization.

18202320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 63 counting only the distinct ones).

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

The square root of 18202320 is about 4266.4177010696. The cubic root of 18202320 is about 263.0523877964.

The spelling of 18202320 in words is "eighteen million, two hundred two thousand, three hundred twenty".