55646020 has 48 divisors (see below), whose sum is σ = 121363200. Its totient is φ = 21415680.

The previous prime is 55645963. The next prime is 55646021. The reversal of 55646020 is 2064655.

It is a self number, because there is not a number n which added to its sum of digits gives 55646020.

It is not an unprimeable number, because it can be changed into a prime (55646021) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 64351 + ... + 65209.

It is an arithmetic number, because the mean of its divisors is an integer number (2528400).

Almost surely, 2^55646020 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 55646020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60681600).

55646020 is an abundant number, since it is smaller than the sum of its proper divisors (65717180).

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

55646020 is a wasteful number, since it uses less digits than its factorization.

55646020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988 (or 986 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 55646020 is about 7459.6259959867. The cubic root of 55646020 is about 381.7784137445.

The spelling of 55646020 in words is "fifty-five million, six hundred forty-six thousand, twenty".