20555828 has 6 divisors (see below), whose sum is σ = 35972706. Its totient is φ = 10277912.

The previous prime is 20555827. The next prime is 20555897. The reversal of 20555828 is 82855502.

It can be written as a sum of positive squares in only one way, i.e., 19731364 + 824464 = 4442^2 + 908^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2569475 + ... + 2569482.

It is an arithmetic number, because the mean of its divisors is an integer number (5995451).

Almost surely, 2^20555828 is an apocalyptic number.

It is an amenable number.

20555828 is a deficient number, since it is larger than the sum of its proper divisors (15416878).

20555828 is a wasteful number, since it uses less digits than its factorization.

20555828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5138961 (or 5138959 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 35.

The square root of 20555828 is about 4533.8535485831. The cubic root of 20555828 is about 273.9334023946.

The spelling of 20555828 in words is "twenty million, five hundred fifty-five thousand, eight hundred twenty-eight".