55920220 has 12 divisors (see below), whose sum is σ = 117432504. Its totient is φ = 22368080.

The previous prime is 55920217. The next prime is 55920251. The reversal of 55920220 is 2202955.

55920220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1397986 + ... + 1398025.

It is an arithmetic number, because the mean of its divisors is an integer number (9786042).

Almost surely, 2^55920220 is an apocalyptic number.

It is an amenable number.

55920220 is an abundant number, since it is smaller than the sum of its proper divisors (61512284).

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

55920220 is a wasteful number, since it uses less digits than its factorization.

55920220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796020 (or 2796018 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 55920220 is about 7477.9823482006. The cubic root of 55920220 is about 382.4044672920.

The spelling of 55920220 in words is "fifty-five million, nine hundred twenty thousand, two hundred twenty".