20651052071 has 4 divisors (see below), whose sum is σ = 22239594552. Its totient is φ = 19062509592.

The previous prime is 20651052061. The next prime is 20651052127. The reversal of 20651052071 is 17025015602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20651052071 - 2⁶ = 20651052007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651052031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794271221 + ... + 794271246.

It is an arithmetic number, because the mean of its divisors is an integer number (5559898638).

Almost surely, 2^20651052071 is an apocalyptic number.

20651052071 is a deficient number, since it is larger than the sum of its proper divisors (1588542481).

20651052071 is a wasteful number, since it uses less digits than its factorization.

20651052071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588542480.

The product of its (nonzero) digits is 4200, while the sum is 29.

Adding to 20651052071 its reverse (17025015602), we get a palindrome (37676067673).

The spelling of 20651052071 in words is "twenty billion, six hundred fifty-one million, fifty-two thousand, seventy-one".