20168363291 has 4 divisors (see below), whose sum is σ = 20172698712. Its totient is φ = 20164027872.

The previous prime is 20168363279. The next prime is 20168363297. The reversal of 20168363291 is 19236386102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20168363291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20168363297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2160725 + ... + 2170038.

It is an arithmetic number, because the mean of its divisors is an integer number (5043174678).

Almost surely, 2^20168363291 is an apocalyptic number.

20168363291 is a deficient number, since it is larger than the sum of its proper divisors (4335421).

20168363291 is an equidigital number, since it uses as much as digits as its factorization.

20168363291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4335420.

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 20168363291 in words is "twenty billion, one hundred sixty-eight million, three hundred sixty-three thousand, two hundred ninety-one".