20816511696 has 60 divisors (see below), whose sum is σ = 61684229412. Its totient is φ = 6530669568.

The previous prime is 20816511691. The next prime is 20816511697. The reversal of 20816511696 is 69611561802.

It can be written as a sum of positive squares in 2 ways, for example, as 16455758400 + 4360753296 = 128280^2 + 66036^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816511691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4249291 + ... + 4254186.

Almost surely, 2^20816511696 is an apocalyptic number.

It is an amenable number.

20816511696 is an abundant number, since it is smaller than the sum of its proper divisors (40867717716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20816511696 is a wasteful number, since it uses less digits than its factorization.

20816511696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8503508 (or 8503499 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 20816511696 in words is "twenty billion, eight hundred sixteen million, five hundred eleven thousand, six hundred ninety-six".