55255920 has 40 divisors (see below), whose sum is σ = 171294096. Its totient is φ = 14734848.

The previous prime is 55255909. The next prime is 55255927. The reversal of 55255920 is 2955255.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55255927) 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, 114877 + ... + 115356.

Almost surely, 2^55255920 is an apocalyptic number.

It is an amenable number.

55255920 is an abundant number, since it is smaller than the sum of its proper divisors (116038176).

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

55255920 is a wasteful number, since it uses less digits than its factorization.

55255920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230249 (or 230243 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 55255920 is about 7433.4325852866. The cubic root of 55255920 is about 380.8841830102.

The spelling of 55255920 in words is "fifty-five million, two hundred fifty-five thousand, nine hundred twenty".