18326247220 has 12 divisors (see below), whose sum is σ = 38485119204. Its totient is φ = 7330498880.

The previous prime is 18326247217. The next prime is 18326247221. The reversal of 18326247220 is 2274262381.

It can be written as a sum of positive squares in 2 ways, for example, as 12300140836 + 6026106384 = 110906^2 + 77628^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18326247220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18326247221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458156161 + ... + 458156200.

It is an arithmetic number, because the mean of its divisors is an integer number (3207093267).

Almost surely, 2^18326247220 is an apocalyptic number.

18326247220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18326247220 is an abundant number, since it is smaller than the sum of its proper divisors (20158871984).

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

18326247220 is a wasteful number, since it uses less digits than its factorization.

18326247220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916312370 (or 916312368 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 18326247220 in words is "eighteen billion, three hundred twenty-six million, two hundred forty-seven thousand, two hundred twenty".