55542220 has 12 divisors (see below), whose sum is σ = 116638704. Its totient is φ = 22216880.

The previous prime is 55542211. The next prime is 55542229. The reversal of 55542220 is 2224555.

It is a happy number.

55542220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55542211) and next prime (55542229).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55542229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1388536 + ... + 1388575.

It is an arithmetic number, because the mean of its divisors is an integer number (9719892).

Almost surely, 2^55542220 is an apocalyptic number.

It is an amenable number.

55542220 is an abundant number, since it is smaller than the sum of its proper divisors (61096484).

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

55542220 is a wasteful number, since it uses less digits than its factorization.

55542220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777120 (or 2777118 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 55542220 is about 7452.6652950471. The cubic root of 55542220 is about 381.5408809405.

Adding to 55542220 its reverse (2224555), we get a palindrome (57766775).

The spelling of 55542220 in words is "fifty-five million, five hundred forty-two thousand, two hundred twenty".