55120220 has 12 divisors (see below), whose sum is σ = 115752504. Its totient is φ = 22048080.

The previous prime is 55120189. The next prime is 55120283. The reversal of 55120220 is 2202155.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1377986 + ... + 1378025.

It is an arithmetic number, because the mean of its divisors is an integer number (9646042).

Almost surely, 2^55120220 is an apocalyptic number.

It is an amenable number.

55120220 is an abundant number, since it is smaller than the sum of its proper divisors (60632284).

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

55120220 is a wasteful number, since it uses less digits than its factorization.

55120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756020 (or 2756018 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 55120220 is about 7424.2992935361. The cubic root of 55120220 is about 380.5721298559.

Adding to 55120220 its reverse (2202155), we get a palindrome (57322375).

The spelling of 55120220 in words is "fifty-five million, one hundred twenty thousand, two hundred twenty".