20894687944 has 64 divisors (see below), whose sum is σ = 42910358400. Its totient is φ = 9480692736.

The previous prime is 20894687911. The next prime is 20894687951. The reversal of 20894687944 is 44978649802.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1481952 + ... + 1495984.

It is an arithmetic number, because the mean of its divisors is an integer number (670474350).

Almost surely, 2^20894687944 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 20894687944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21455179200).

20894687944 is an abundant number, since it is smaller than the sum of its proper divisors (22015670456).

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

20894687944 is a wasteful number, since it uses less digits than its factorization.

20894687944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14294 (or 14290 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 61.

The spelling of 20894687944 in words is "twenty billion, eight hundred ninety-four million, six hundred eighty-seven thousand, nine hundred forty-four".