20579208531918 has 64 divisors (see below), whose sum is σ = 43777400832000. Its totient is φ = 6431112050400.

The previous prime is 20579208531911. The next prime is 20579208531923. The reversal of 20579208531918 is 81913580297502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20579208531911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2254483 + ... + 6800081.

It is an arithmetic number, because the mean of its divisors is an integer number (684021888000).

Almost surely, 2^{20579208531918} is an apocalyptic number.

20579208531918 is an abundant number, since it is smaller than the sum of its proper divisors (23198192300082).

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

20579208531918 is a wasteful number, since it uses less digits than its factorization.

20579208531918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546037.

The product of its (nonzero) digits is 10886400, while the sum is 60.

The spelling of 20579208531918 in words is "twenty trillion, five hundred seventy-nine billion, two hundred eight million, five hundred thirty-one thousand, nine hundred eighteen".