20871116994 has 128 divisors (see below), whose sum is σ = 52738011648. Its totient is φ = 5359011840.

The previous prime is 20871116989. The next prime is 20871117013. The reversal of 20871116994 is 49961117802.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19094712 + ... + 19095804.

It is an arithmetic number, because the mean of its divisors is an integer number (412015716).

Almost surely, 2^20871116994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20871116994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26369005824).

20871116994 is an abundant number, since it is smaller than the sum of its proper divisors (31866894654).

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

20871116994 is a wasteful number, since it uses less digits than its factorization.

20871116994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012.

The product of its (nonzero) digits is 217728, while the sum is 48.

The spelling of 20871116994 in words is "twenty billion, eight hundred seventy-one million, one hundred sixteen thousand, nine hundred ninety-four".