20550856 has 32 divisors (see below), whose sum is σ = 41342400. Its totient is φ = 9547200.

The previous prime is 20550809. The next prime is 20550857. The reversal of 20550856 is 65805502.

It is not an unprimeable number, because it can be changed into a prime (20550857) 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 7 ways as a sum of consecutive naturals, for example, 6781 + ... + 9331.

It is an arithmetic number, because the mean of its divisors is an integer number (1291950).

Almost surely, 2^20550856 is an apocalyptic number.

It is an amenable number.

20550856 is an abundant number, since it is smaller than the sum of its proper divisors (20791544).

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

20550856 is a wasteful number, since it uses less digits than its factorization.

20550856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2629 (or 2625 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 20550856 is about 4533.3051959911. The cubic root of 20550856 is about 273.9113144705.

The spelling of 20550856 in words is "twenty million, five hundred fifty thousand, eight hundred fifty-six".