20776899584 has 132 divisors (see below), whose sum is σ = 48101617824. Its totient is φ = 8786706432.

The previous prime is 20776899581. The next prime is 20776899601. The reversal of 20776899584 is 48599867702.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20776899584.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20776899581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91528079 + ... + 91528305.

Almost surely, 2^20776899584 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 20776899584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24050808912).

20776899584 is an abundant number, since it is smaller than the sum of its proper divisors (27324718240).

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

20776899584 is an equidigital number, since it uses as much as digits as its factorization.

20776899584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 65.

The spelling of 20776899584 in words is "twenty billion, seven hundred seventy-six million, eight hundred ninety-nine thousand, five hundred eighty-four".