19929649742 has 4 divisors (see below), whose sum is σ = 29894474616. Its totient is φ = 9964824870.

The previous prime is 19929649723. The next prime is 19929649757. The reversal of 19929649742 is 24794692991.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982412434 + ... + 4982412437.

It is an arithmetic number, because the mean of its divisors is an integer number (7473618654).

Almost surely, 2^19929649742 is an apocalyptic number.

19929649742 is a deficient number, since it is larger than the sum of its proper divisors (9964824874).

19929649742 is an equidigital number, since it uses as much as digits as its factorization.

19929649742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9964824873.

The product of its digits is 17635968, while the sum is 62.

The spelling of 19929649742 in words is "nineteen billion, nine hundred twenty-nine million, six hundred forty-nine thousand, seven hundred forty-two".