55243020 has 96 divisors (see below), whose sum is σ = 178633728. Its totient is φ = 12494592.

The previous prime is 55243009. The next prime is 55243021. The reversal of 55243020 is 2034255.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (55243021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42622 + ... + 43898.

It is an arithmetic number, because the mean of its divisors is an integer number (1860768).

Almost surely, 2^55243020 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 55243020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89316864).

55243020 is an abundant number, since it is smaller than the sum of its proper divisors (123390708).

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

55243020 is a wasteful number, since it uses less digits than its factorization.

55243020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399 (or 1397 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 55243020 is about 7432.5648332187. The cubic root of 55243020 is about 380.8545404044.

Adding to 55243020 its reverse (2034255), we get a palindrome (57277275).

The spelling of 55243020 in words is "fifty-five million, two hundred forty-three thousand, twenty".