20756164605 has 16 divisors (see below), whose sum is σ = 36228942144. Its totient is φ = 10063594880.

The previous prime is 20756164601. The next prime is 20756164631. The reversal of 20756164605 is 50646165702.

It is not a de Polignac number, because 20756164605 - 2² = 20756164601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20756164601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62897304 + ... + 62897633.

It is an arithmetic number, because the mean of its divisors is an integer number (2264308884).

Almost surely, 2^20756164605 is an apocalyptic number.

It is an amenable number.

20756164605 is a deficient number, since it is larger than the sum of its proper divisors (15472777539).

20756164605 is a wasteful number, since it uses less digits than its factorization.

20756164605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125794956.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 20756164605 in words is "twenty billion, seven hundred fifty-six million, one hundred sixty-four thousand, six hundred five".