20511328325 has 48 divisors (see below), whose sum is σ = 27862819344. Its totient is φ = 14915174400.

The previous prime is 20511328247. The next prime is 20511328349. The reversal of 20511328325 is 52382311502.

It can be written as a sum of positive squares in 24 ways, for example, as 5381836321 + 15129492004 = 73361^2 + 123002^2 .

It is not a de Polignac number, because 20511328325 - 2²⁰ = 20510279749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20511328291 and 20511328300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2149565 + ... + 2159085.

It is an arithmetic number, because the mean of its divisors is an integer number (580475403).

Almost surely, 2^20511328325 is an apocalyptic number.

20511328325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20511328325 is a deficient number, since it is larger than the sum of its proper divisors (7351491019).

20511328325 is a wasteful number, since it uses less digits than its factorization.

20511328325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9722 (or 9717 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 20511328325 its reverse (52382311502), we get a palindrome (72893639827).

The spelling of 20511328325 in words is "twenty billion, five hundred eleven million, three hundred twenty-eight thousand, three hundred twenty-five".