55569820 has 24 divisors (see below), whose sum is σ = 118011600. Its totient is φ = 21977472.

The previous prime is 55569809. The next prime is 55569859. The reversal of 55569820 is 2896555.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13830 + ... + 17389.

It is an arithmetic number, because the mean of its divisors is an integer number (4917150).

Almost surely, 2^55569820 is an apocalyptic number.

It is an amenable number.

55569820 is an abundant number, since it is smaller than the sum of its proper divisors (62441780).

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

55569820 is a wasteful number, since it uses less digits than its factorization.

55569820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31317 (or 31315 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 55569820 is about 7454.5167516077. The cubic root of 55569820 is about 381.6040688152.

It can be divided in two parts, 5556 and 9820, that added together give a square (15376 = 124²).

The spelling of 55569820 in words is "fifty-five million, five hundred sixty-nine thousand, eight hundred twenty".