18231423220 has 48 divisors (see below), whose sum is σ = 40611306960. Its totient is φ = 6851201024.

The previous prime is 18231423193. The next prime is 18231423283. The reversal of 18231423220 is 2232413281.

It can be written as a sum of positive squares in 8 ways, for example, as 618417424 + 17613005796 = 24868^2 + 132714^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141246 + ... + 237514.

It is an arithmetic number, because the mean of its divisors is an integer number (846068895).

Almost surely, 2^18231423220 is an apocalyptic number.

18231423220 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 18231423220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20305653480).

18231423220 is an abundant number, since it is smaller than the sum of its proper divisors (22379883740).

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

18231423220 is a wasteful number, since it uses less digits than its factorization.

18231423220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96852 (or 96850 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 18231423220 in words is "eighteen billion, two hundred thirty-one million, four hundred twenty-three thousand, two hundred twenty".