20971676205 has 12 divisors (see below), whose sum is σ = 36350905500. Its totient is φ = 11184893952.

The previous prime is 20971676171. The next prime is 20971676237. The reversal of 20971676205 is 50267617902.

20971676205 is a `hidden beast` number, since 2 + 0 + 9 + 7 + 16 + 7 + 620 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2926052649 + 18045623556 = 54093^2 + 134334^2 .

It is not a de Polignac number, because 20971676205 - 2⁹ = 20971675693 is a prime.

It is a super-2 number, since 2×20971676205² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 466037249 = 20971676205 / (2 + 0 + 9 + 7 + 1 + 6 + 7 + 6 + 2 + 0 + 5).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 233018580 + ... + 233018669.

It is an arithmetic number, because the mean of its divisors is an integer number (3029242125).

Almost surely, 2^20971676205 is an apocalyptic number.

It is an amenable number.

20971676205 is a deficient number, since it is larger than the sum of its proper divisors (15379229295).

20971676205 is a wasteful number, since it uses less digits than its factorization.

20971676205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466037260 (or 466037257 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 20971676205 in words is "twenty billion, nine hundred seventy-one million, six hundred seventy-six thousand, two hundred five".