20356896191 has 16 divisors (see below), whose sum is σ = 21599984640. Its totient is φ = 19131577920.

The previous prime is 20356896179. The next prime is 20356896223. The reversal of 20356896191 is 19169865302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20356896191 - 2¹⁸ = 20356634047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356896151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1246706 + ... + 1262928.

It is an arithmetic number, because the mean of its divisors is an integer number (1349999040).

Almost surely, 2^20356896191 is an apocalyptic number.

20356896191 is a deficient number, since it is larger than the sum of its proper divisors (1243088449).

20356896191 is a wasteful number, since it uses less digits than its factorization.

20356896191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16766.

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 20356896191 in words is "twenty billion, three hundred fifty-six million, eight hundred ninety-six thousand, one hundred ninety-one".