20706838565 has 16 divisors (see below), whose sum is σ = 28404676992. Its totient is φ = 14195611584.

The previous prime is 20706838543. The next prime is 20706838573. The reversal of 20706838565 is 56583860702.

It is not a de Polignac number, because 20706838565 - 2²⁴ = 20690061349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84602 + ... + 220388.

It is an arithmetic number, because the mean of its divisors is an integer number (1775292312).

Almost surely, 2^20706838565 is an apocalyptic number.

It is an amenable number.

20706838565 is a deficient number, since it is larger than the sum of its proper divisors (7697838427).

20706838565 is a wasteful number, since it uses less digits than its factorization.

20706838565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140156.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 20706838565 in words is "twenty billion, seven hundred six million, eight hundred thirty-eight thousand, five hundred sixty-five".