55600220 has 24 divisors (see below), whose sum is σ = 125742624. Its totient is φ = 20529216.

The previous prime is 55600187. The next prime is 55600229. The reversal of 55600220 is 2200655.

55600220 = 31² + 32² + ... + 550².

It is a happy number.

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 = 55600192 and 55600201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55600229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106664 + ... + 107183.

It is an arithmetic number, because the mean of its divisors is an integer number (5239276).

Almost surely, 2^55600220 is an apocalyptic number.

It is an amenable number.

55600220 is an abundant number, since it is smaller than the sum of its proper divisors (70142404).

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

55600220 is a wasteful number, since it uses less digits than its factorization.

55600220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213869 (or 213867 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 55600220 is about 7456.5555050573. Note that the first 4 decimals coincide. The cubic root of 55600220 is about 381.6736428448.

Adding to 55600220 its reverse (2200655), we get a palindrome (57800875).

The spelling of 55600220 in words is "fifty-five million, six hundred thousand, two hundred twenty".