20764646571 has 8 divisors (see below), whose sum is σ = 27786146704. Its totient is φ = 13793122080.

The previous prime is 20764646569. The next prime is 20764646659. The reversal of 20764646571 is 17564646702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20764646571 - 2¹ = 20764646569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20764646571.

It is not an unprimeable number, because it can be changed into a prime (20764646521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12492940 + ... + 12494601.

It is an arithmetic number, because the mean of its divisors is an integer number (3473268338).

Almost surely, 2^20764646571 is an apocalyptic number.

20764646571 is a deficient number, since it is larger than the sum of its proper divisors (7021500133).

20764646571 is a wasteful number, since it uses less digits than its factorization.

20764646571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24987821.

The product of its (nonzero) digits is 1693440, while the sum is 48.

The spelling of 20764646571 in words is "twenty billion, seven hundred sixty-four million, six hundred forty-six thousand, five hundred seventy-one".