20466991272 has 128 divisors (see below), whose sum is σ = 63121766400. Its totient is φ = 5385339648.

The previous prime is 20466991261. The next prime is 20466991277. The reversal of 20466991272 is 27219966402.

It is not an unprimeable number, because it can be changed into a prime (20466991277) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 948103 + ... + 969449.

It is an arithmetic number, because the mean of its divisors is an integer number (493138800).

Almost surely, 2^20466991272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20466991272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31560883200).

20466991272 is an abundant number, since it is smaller than the sum of its proper divisors (42654775128).

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

20466991272 is a wasteful number, since it uses less digits than its factorization.

20466991272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21815 (or 21811 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 20466991272 in words is "twenty billion, four hundred sixty-six million, nine hundred ninety-one thousand, two hundred seventy-two".