20816651712 has 56 divisors (see below), whose sum is σ = 57976211200. Its totient is φ = 6573678336.

The previous prime is 20816651671. The next prime is 20816651717. The reversal of 20816651712 is 21715661802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816651717) 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, 2849512 + ... + 2856807.

Almost surely, 2^20816651712 is an apocalyptic number.

It is an amenable number.

20816651712 is an abundant number, since it is smaller than the sum of its proper divisors (37159559488).

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

20816651712 is a wasteful number, since it uses less digits than its factorization.

20816651712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5706353 (or 5706343 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 20816651712 in words is "twenty billion, eight hundred sixteen million, six hundred fifty-one thousand, seven hundred twelve".