18329768420 has 96 divisors (see below), whose sum is σ = 40463388000. Its totient is φ = 6965633024.

The previous prime is 18329768399. The next prime is 18329768423. The reversal of 18329768420 is 2486792381.

It can be written as a sum of positive squares in 16 ways, for example, as 11813081344 + 6516687076 = 108688^2 + 80726^2 .

It is not an unprimeable number, because it can be changed into a prime (18329768423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9764522 + ... + 9766398.

It is an arithmetic number, because the mean of its divisors is an integer number (421493625).

Almost surely, 2^18329768420 is an apocalyptic number.

18329768420 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 18329768420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20231694000).

18329768420 is an abundant number, since it is smaller than the sum of its proper divisors (22133619580).

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

18329768420 is a wasteful number, since it uses less digits than its factorization.

18329768420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177 (or 2175 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 18329768420 in words is "eighteen billion, three hundred twenty-nine million, seven hundred sixty-eight thousand, four hundred twenty".