20906711065 has 16 divisors (see below), whose sum is σ = 26202836160. Its totient is φ = 15997504320.

The previous prime is 20906711041. The next prime is 20906711083. The reversal of 20906711065 is 56011760902.

It is a de Polignac number, because none of the positive numbers 2^k-20906711065 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

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, 946791 + ... + 968620.

It is an arithmetic number, because the mean of its divisors is an integer number (1637677260).

Almost surely, 2^20906711065 is an apocalyptic number.

It is an amenable number.

20906711065 is a deficient number, since it is larger than the sum of its proper divisors (5296125095).

20906711065 is a wasteful number, since it uses less digits than its factorization.

20906711065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915512.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 20906711065 in words is "twenty billion, nine hundred six million, seven hundred eleven thousand, sixty-five".