20556044 has 12 divisors (see below), whose sum is σ = 36160824. Its totient is φ = 10224384.

The previous prime is 20556031. The next prime is 20556049. The reversal of 20556044 is 44065502.

It is not an unprimeable number, because it can be changed into a prime (20556049) 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, 12542 + ... + 14085.

It is an arithmetic number, because the mean of its divisors is an integer number (3013402).

Almost surely, 2^20556044 is an apocalyptic number.

It is an amenable number.

20556044 is a deficient number, since it is larger than the sum of its proper divisors (15604780).

20556044 is a wasteful number, since it uses less digits than its factorization.

20556044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26824 (or 26822 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20556044 is about 4533.8773693165. The cubic root of 20556044 is about 273.9343618858.

The spelling of 20556044 in words is "twenty million, five hundred fifty-six thousand, forty-four".