19906863747 has 4 divisors (see below), whose sum is σ = 26542485000. Its totient is φ = 13271242496.

The previous prime is 19906863731. The next prime is 19906863797. The reversal of 19906863747 is 74736860991.

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 19906863747 - 2⁴ = 19906863731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19906863797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3317810622 + ... + 3317810627.

It is an arithmetic number, because the mean of its divisors is an integer number (6635621250).

Almost surely, 2^19906863747 is an apocalyptic number.

19906863747 is a deficient number, since it is larger than the sum of its proper divisors (6635621253).

19906863747 is an equidigital number, since it uses as much as digits as its factorization.

19906863747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6635621252.

The product of its (nonzero) digits is 13716864, while the sum is 60.

The spelling of 19906863747 in words is "nineteen billion, nine hundred six million, eight hundred sixty-three thousand, seven hundred forty-seven".