55820220 has 24 divisors (see below), whose sum is σ = 156296784. Its totient is φ = 14885376.

The previous prime is 55820207. The next prime is 55820227. The reversal of 55820220 is 2202855.

55820220 = 2638² + 2639² + ... + 2645².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55820227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465109 + ... + 465228.

It is an arithmetic number, because the mean of its divisors is an integer number (6512366).

Almost surely, 2^55820220 is an apocalyptic number.

It is an amenable number.

55820220 is an abundant number, since it is smaller than the sum of its proper divisors (100476564).

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

55820220 is a wasteful number, since it uses less digits than its factorization.

55820220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930349 (or 930347 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 55820220 is about 7471.2930607760. The cubic root of 55820220 is about 382.1763848318.

The spelling of 55820220 in words is "fifty-five million, eight hundred twenty thousand, two hundred twenty".