20911712976 has 480 divisors, whose sum is σ = 78982944768. Its totient is φ = 5193745920.

The previous prime is 20911712959. The next prime is 20911712977. The reversal of 20911712976 is 67921711902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20911712977) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6884130 + ... + 6887166.

Almost surely, 2^20911712976 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 20911712976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39491472384).

20911712976 is an abundant number, since it is smaller than the sum of its proper divisors (58071231792).

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

20911712976 is a wasteful number, since it uses less digits than its factorization.

20911712976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101 (or 3083 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The spelling of 20911712976 in words is "twenty billion, nine hundred eleven million, seven hundred twelve thousand, nine hundred seventy-six".