19906743046 has 4 divisors (see below), whose sum is σ = 29860114572. Its totient is φ = 9953371522.

The previous prime is 19906743007. The next prime is 19906743053. The reversal of 19906743046 is 64034760991.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4976685760 + ... + 4976685763.

It is an arithmetic number, because the mean of its divisors is an integer number (7465028643).

Almost surely, 2^19906743046 is an apocalyptic number.

19906743046 is a deficient number, since it is larger than the sum of its proper divisors (9953371526).

19906743046 is an equidigital number, since it uses as much as digits as its factorization.

19906743046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9953371525.

The product of its (nonzero) digits is 979776, while the sum is 49.

The spelling of 19906743046 in words is "nineteen billion, nine hundred six million, seven hundred forty-three thousand, forty-six".