55203120 has 200 divisors, whose sum is σ = 219298464. Its totient is φ = 12607488.

The previous prime is 55203107. The next prime is 55203163. The reversal of 55203120 is 2130255.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 55203093 and 55203102.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 44752 + ... + 45968.

Almost surely, 2^55203120 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 55203120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109649232).

55203120 is an abundant number, since it is smaller than the sum of its proper divisors (164095344).

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

55203120 is a wasteful number, since it uses less digits than its factorization.

55203120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 55203120 is about 7429.8802143776. The cubic root of 55203120 is about 380.7628259147.

Adding to 55203120 its reverse (2130255), we get a palindrome (57333375).

The spelling of 55203120 in words is "fifty-five million, two hundred three thousand, one hundred twenty".