55505020 has 24 divisors (see below), whose sum is σ = 117079200. Its totient is φ = 22103232.

The previous prime is 55504997. The next prime is 55505029. The reversal of 55505020 is 2050555.

It is a junction number, because it is equal to n+sod(n) for n = 55504982 and 55505000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55505029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1480 + ... + 10639.

It is an arithmetic number, because the mean of its divisors is an integer number (4878300).

Almost surely, 2^55505020 is an apocalyptic number.

It is an amenable number.

55505020 is an abundant number, since it is smaller than the sum of its proper divisors (61574180).

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

55505020 is a wasteful number, since it uses less digits than its factorization.

55505020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12357 (or 12355 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 22.

The square root of 55505020 is about 7450.1691255971. The cubic root of 55505020 is about 381.4556815453.

Adding to 55505020 its reverse (2050555), we get a palindrome (57555575).

The spelling of 55505020 in words is "fifty-five million, five hundred five thousand, twenty".