20186963691 has 32 divisors (see below), whose sum is σ = 27550236672. Its totient is φ = 13144344960.

The previous prime is 20186963683. The next prime is 20186963779. The reversal of 20186963691 is 19636968102.

It is not a de Polignac number, because 20186963691 - 2³ = 20186963683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20186968691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20535586 + ... + 20536568.

It is an arithmetic number, because the mean of its divisors is an integer number (860944896).

Almost surely, 2^20186963691 is an apocalyptic number.

20186963691 is a deficient number, since it is larger than the sum of its proper divisors (7363272981).

20186963691 is a wasteful number, since it uses less digits than its factorization.

20186963691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723.

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 20186963691 in words is "twenty billion, one hundred eighty-six million, nine hundred sixty-three thousand, six hundred ninety-one".