55320520 has 64 divisors (see below), whose sum is σ = 131051520. Its totient is φ = 20976384.

The previous prime is 55320481. The next prime is 55320541. The reversal of 55320520 is 2502355.

55320520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 55320491 and 55320500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144249 + ... + 144631.

It is an arithmetic number, because the mean of its divisors is an integer number (2047680).

Almost surely, 2^55320520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55320520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65525760).

55320520 is an abundant number, since it is smaller than the sum of its proper divisors (75731000).

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

55320520 is a wasteful number, since it uses less digits than its factorization.

55320520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 22.

The square root of 55320520 is about 7437.7765494804. The cubic root of 55320520 is about 381.0325564683.

Adding to 55320520 its reverse (2502355), we get a palindrome (57822875).

The spelling of 55320520 in words is "fifty-five million, three hundred twenty thousand, five hundred twenty".