20579449543 has 16 divisors (see below), whose sum is σ = 21360401920. Its totient is φ = 19810689696.

The previous prime is 20579449531. The next prime is 20579449559. The reversal of 20579449543 is 34594497502.

It is a cyclic number.

It is not a de Polignac number, because 20579449543 - 2²⁹ = 20042578631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20579449243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6198838 + ... + 6202156.

It is an arithmetic number, because the mean of its divisors is an integer number (1335025120).

Almost surely, 2^20579449543 is an apocalyptic number.

20579449543 is a deficient number, since it is larger than the sum of its proper divisors (780952377).

20579449543 is a wasteful number, since it uses less digits than its factorization.

20579449543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5086.

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 20579449543 in words is "twenty billion, five hundred seventy-nine million, four hundred forty-nine thousand, five hundred forty-three".