20523102320 has 160 divisors (see below), whose sum is σ = 58261747200. Its totient is φ = 6566427648.

The previous prime is 20523102283. The next prime is 20523102323. The reversal of 20523102320 is 2320132502.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20523102292 and 20523102301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523102323) 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, 698486 + ... + 727274.

It is an arithmetic number, because the mean of its divisors is an integer number (364135920).

Almost surely, 2^20523102320 is an apocalyptic number.

20523102320 is a gapful number since it is divisible by the number (20) 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 20523102320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29130873600).

20523102320 is an abundant number, since it is smaller than the sum of its proper divisors (37738644880).

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

20523102320 is a wasteful number, since it uses less digits than its factorization.

20523102320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28895 (or 28889 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 20523102320 its reverse (2320132502), we get a palindrome (22843234822).

The spelling of 20523102320 in words is "twenty billion, five hundred twenty-three million, one hundred two thousand, three hundred twenty".