20776894240 has 24 divisors (see below), whose sum is σ = 49085413020. Its totient is φ = 8310757632.

The previous prime is 20776894217. The next prime is 20776894249. The reversal of 20776894240 is 4249867702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20436417936 + 340476304 = 142956^2 + 18452^2 .

It is not an unprimeable number, because it can be changed into a prime (20776894249) 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 3 ways as a sum of consecutive naturals, for example, 64927635 + ... + 64927954.

Almost surely, 2^20776894240 is an apocalyptic number.

20776894240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20776894240 is an abundant number, since it is smaller than the sum of its proper divisors (28308518780).

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

20776894240 is a wasteful number, since it uses less digits than its factorization.

20776894240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129855604 (or 129855596 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 20776894240 in words is "twenty billion, seven hundred seventy-six million, eight hundred ninety-four thousand, two hundred forty".