20760055821 has 12 divisors (see below), whose sum is σ = 30152422300. Its totient is φ = 13763571840.

The previous prime is 20760055817. The next prime is 20760055837. The reversal of 20760055821 is 12855006702.

It is a happy number.

20760055821 is a `hidden beast` number, since 2 + 0 + 76 + 0 + 0 + 5 + 582 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2620006596 + 18140049225 = 51186^2 + 134685^2 .

It is not a de Polignac number, because 20760055821 - 2² = 20760055817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20760055021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6370396 + ... + 6373653.

Almost surely, 2^20760055821 is an apocalyptic number.

It is an amenable number.

20760055821 is a deficient number, since it is larger than the sum of its proper divisors (9392366479).

20760055821 is a wasteful number, since it uses less digits than its factorization.

20760055821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12744236 (or 12744233 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 20760055821 in words is "twenty billion, seven hundred sixty million, fifty-five thousand, eight hundred twenty-one".