20894605872 has 120 divisors (see below), whose sum is σ = 62910317232. Its totient is φ = 5958489600.

The previous prime is 20894605867. The next prime is 20894605873. The reversal of 20894605872 is 27850649802.

It is not an unprimeable number, because it can be changed into a prime (20894605873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1264222 + ... + 1280642.

Almost surely, 2^20894605872 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 20894605872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31455158616).

20894605872 is an abundant number, since it is smaller than the sum of its proper divisors (42015711360).

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

20894605872 is a wasteful number, since it uses less digits than its factorization.

20894605872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16987 (or 16974 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 20894605872 in words is "twenty billion, eight hundred ninety-four million, six hundred five thousand, eight hundred seventy-two".