20504844 has 18 divisors (see below), whose sum is σ = 51831780. Its totient is φ = 6834936.

The previous prime is 20504843. The next prime is 20504903. The reversal of 20504844 is 44840502.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (20504843) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 284754 + ... + 284825.

Almost surely, 2^20504844 is an apocalyptic number.

It is an amenable number.

20504844 is an abundant number, since it is smaller than the sum of its proper divisors (31326936).

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

20504844 is a wasteful number, since it uses less digits than its factorization.

20504844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569589 (or 569584 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 20504844 is about 4528.2274677847. The cubic root of 20504844 is about 273.7067386444.

The spelling of 20504844 in words is "twenty million, five hundred four thousand, eight hundred forty-four".