19946807311 has 4 divisors (see below), whose sum is σ = 19967350824. Its totient is φ = 19926263800.

The previous prime is 19946807303. The next prime is 19946807317. The reversal of 19946807311 is 11370864991.

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

It is a cyclic number.

It is not a de Polignac number, because 19946807311 - 2³ = 19946807303 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 (19946807317) 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, 10270300 + ... + 10272241.

It is an arithmetic number, because the mean of its divisors is an integer number (4991837706).

Almost surely, 2^19946807311 is an apocalyptic number.

19946807311 is a deficient number, since it is larger than the sum of its proper divisors (20543513).

19946807311 is an equidigital number, since it uses as much as digits as its factorization.

19946807311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20543512.

The product of its (nonzero) digits is 326592, while the sum is 49.

The spelling of 19946807311 in words is "nineteen billion, nine hundred forty-six million, eight hundred seven thousand, three hundred eleven".