55253820 has 48 divisors (see below), whose sum is σ = 161441280. Its totient is φ = 14093376.

The previous prime is 55253801. The next prime is 55253827. The reversal of 55253820 is 2835255.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55253827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18640 + ... + 21399.

It is an arithmetic number, because the mean of its divisors is an integer number (3363360).

Almost surely, 2^55253820 is an apocalyptic number.

It is an amenable number.

55253820 is an abundant number, since it is smaller than the sum of its proper divisors (106187460).

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

55253820 is a wasteful number, since it uses less digits than its factorization.

55253820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40074 (or 40072 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 55253820 is about 7433.2913302251. The cubic root of 55253820 is about 380.8793577841.

The spelling of 55253820 in words is "fifty-five million, two hundred fifty-three thousand, eight hundred twenty".