20939809583 has 16 divisors (see below), whose sum is σ = 26743530240. Its totient is φ = 15918763200.

The previous prime is 20939809577. The next prime is 20939809607. The reversal of 20939809583 is 38590893902.

It is a cyclic number.

It is not a de Polignac number, because 20939809583 - 2²⁴ = 20923032367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20939803583) 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, 3313253 + ... + 3319566.

It is an arithmetic number, because the mean of its divisors is an integer number (1671470640).

Almost surely, 2^20939809583 is an apocalyptic number.

20939809583 is a deficient number, since it is larger than the sum of its proper divisors (5803720657).

20939809583 is a wasteful number, since it uses less digits than its factorization.

20939809583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6632878.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The spelling of 20939809583 in words is "twenty billion, nine hundred thirty-nine million, eight hundred nine thousand, five hundred eighty-three".