20320520 has 32 divisors (see below), whose sum is σ = 49878720. Its totient is φ = 7389120.

The previous prime is 20320507. The next prime is 20320537. The reversal of 20320520 is 2502302.

It is a junction number, because it is equal to n+sod(n) for n = 20320495 and 20320504.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22652 + ... + 23531.

It is an arithmetic number, because the mean of its divisors is an integer number (1558710).

Almost surely, 2^20320520 is an apocalyptic number.

20320520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20320520 is an abundant number, since it is smaller than the sum of its proper divisors (29558200).

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

20320520 is a wasteful number, since it uses less digits than its factorization.

20320520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46205 (or 46201 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 20320520 is about 4507.8287456380. The cubic root of 20320520 is about 272.8841256645.

Adding to 20320520 its reverse (2502302), we get a palindrome (22822822).

The spelling of 20320520 in words is "twenty million, three hundred twenty thousand, five hundred twenty".