55242420 has 24 divisors (see below), whose sum is σ = 154678944. Its totient is φ = 14731296.

The previous prime is 55242391. The next prime is 55242479. The reversal of 55242420 is 2424255.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460294 + ... + 460413.

It is an arithmetic number, because the mean of its divisors is an integer number (6444956).

Almost surely, 2^55242420 is an apocalyptic number.

It is an amenable number.

55242420 is an abundant number, since it is smaller than the sum of its proper divisors (99436524).

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

55242420 is a wasteful number, since it uses less digits than its factorization.

55242420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920719 (or 920717 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 55242420 is about 7432.5244701918. The cubic root of 55242420 is about 380.8531615662.

Adding to 55242420 its reverse (2424255), we get a palindrome (57666675).

It can be divided in two parts, 5 and 5242420, that added together give a palindrome (5242425).

The spelling of 55242420 in words is "fifty-five million, two hundred forty-two thousand, four hundred twenty".