20769047828 has 12 divisors (see below), whose sum is σ = 36504550740. Its totient is φ = 10339176192.

The previous prime is 20769047821. The next prime is 20769047851. The reversal of 20769047828 is 82874096702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19151238544 + 1617809284 = 138388^2 + 40222^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20769047828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20769047821) 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, 11335901 + ... + 11337732.

It is an arithmetic number, because the mean of its divisors is an integer number (3042045895).

Almost surely, 2^20769047828 is an apocalyptic number.

It is an amenable number.

20769047828 is a deficient number, since it is larger than the sum of its proper divisors (15735502912).

20769047828 is a wasteful number, since it uses less digits than its factorization.

20769047828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22673866 (or 22673864 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 20769047828 in words is "twenty billion, seven hundred sixty-nine million, forty-seven thousand, eight hundred twenty-eight".