20556441 has 12 divisors (see below), whose sum is σ = 30650880. Its totient is φ = 13262040.

The previous prime is 20556433. The next prime is 20556467. The reversal of 20556441 is 14465502.

It is not a de Polignac number, because 20556441 - 2³ = 20556433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20556491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36561 + ... + 37118.

It is an arithmetic number, because the mean of its divisors is an integer number (2554240).

Almost surely, 2^20556441 is an apocalyptic number.

It is an amenable number.

20556441 is a deficient number, since it is larger than the sum of its proper divisors (10094439).

20556441 is a wasteful number, since it uses less digits than its factorization.

20556441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73716 (or 73713 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 20556441 is about 4533.9211506157. The cubic root of 20556441 is about 273.9361253775.

The spelling of 20556441 in words is "twenty million, five hundred fifty-six thousand, four hundred forty-one".