20683927091 has 16 divisors (see below), whose sum is σ = 21205351200. Its totient is φ = 20169762048.

The previous prime is 20683927067. The next prime is 20683927111. The reversal of 20683927091 is 19072938602.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20683927091 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20683927001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4047560 + ... + 4052666.

It is an arithmetic number, because the mean of its divisors is an integer number (1325334450).

Almost surely, 2^20683927091 is an apocalyptic number.

20683927091 is a deficient number, since it is larger than the sum of its proper divisors (521424109).

20683927091 is a wasteful number, since it uses less digits than its factorization.

20683927091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5798.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 20683927091 in words is "twenty billion, six hundred eighty-three million, nine hundred twenty-seven thousand, ninety-one".