20067690861 has 24 divisors (see below), whose sum is σ = 29247075000. Its totient is φ = 13258678272.

The previous prime is 20067690857. The next prime is 20067690869. The reversal of 20067690861 is 16809676002.

It can be written as a sum of positive squares in 4 ways, for example, as 2163645225 + 17904045636 = 46515^2 + 133806^2 .

It is not a de Polignac number, because 20067690861 - 2² = 20067690857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20067690869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 585445 + ... + 618773.

It is an arithmetic number, because the mean of its divisors is an integer number (1218628125).

Almost surely, 2^20067690861 is an apocalyptic number.

It is an amenable number.

20067690861 is a deficient number, since it is larger than the sum of its proper divisors (9179384139).

20067690861 is a wasteful number, since it uses less digits than its factorization.

20067690861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33933 (or 33930 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 20067690861 in words is "twenty billion, sixty-seven million, six hundred ninety thousand, eight hundred sixty-one".