20511664712 has 32 divisors (see below), whose sum is σ = 47949347520. Its totient is φ = 7991557440.

The previous prime is 20511664709. The next prime is 20511664751. The reversal of 20511664712 is 21746611502.

It is a nialpdrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16648463 + ... + 16649694.

It is an arithmetic number, because the mean of its divisors is an integer number (1498417110).

Almost surely, 2^20511664712 is an apocalyptic number.

20511664712 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20511664712 is an abundant number, since it is smaller than the sum of its proper divisors (27437682808).

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

20511664712 is a wasteful number, since it uses less digits than its factorization.

20511664712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33298181 (or 33298177 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 20511664712 in words is "twenty billion, five hundred eleven million, six hundred sixty-four thousand, seven hundred twelve".