20802976064 has 168 divisors, whose sum is σ = 47227321344. Its totient is φ = 9024537600.

The previous prime is 20802976049. The next prime is 20802976067. The reversal of 20802976064 is 46067920802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20802976067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158801279 + ... + 158801409.

It is an arithmetic number, because the mean of its divisors is an integer number (281115008).

Almost surely, 2^20802976064 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 20802976064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23613660672).

20802976064 is an abundant number, since it is smaller than the sum of its proper divisors (26424345280).

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

20802976064 is a wasteful number, since it uses less digits than its factorization.

20802976064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 20802976064 in words is "twenty billion, eight hundred two million, nine hundred seventy-six thousand, sixty-four".