20556608 has 28 divisors (see below), whose sum is σ = 41899332. Its totient is φ = 9999360.

The previous prime is 20556607. The next prime is 20556617. The reversal of 20556608 is 80665502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17707264 + 2849344 = 4208^2 + 1688^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556607) 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 in 3 ways as a sum of consecutive naturals, for example, 1973 + ... + 6708.

Almost surely, 2^20556608 is an apocalyptic number.

It is an amenable number.

20556608 is an abundant number, since it is smaller than the sum of its proper divisors (21342724).

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

20556608 is an equidigital number, since it uses as much as digits as its factorization.

20556608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8730 (or 8720 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 20556608 is about 4533.9395673079. The cubic root of 20556608 is about 273.9368671922.

The spelling of 20556608 in words is "twenty million, five hundred fifty-six thousand, six hundred eight".