19420031805 has 8 divisors (see below), whose sum is σ = 31072050912. Its totient is φ = 10357350288.

The previous prime is 19420031713. The next prime is 19420031831. The reversal of 19420031805 is 50813002491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19420031805 - 2²³ = 19411643197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647334379 + ... + 647334408.

It is an arithmetic number, because the mean of its divisors is an integer number (3884006364).

Almost surely, 2^19420031805 is an apocalyptic number.

19420031805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19420031805 is a deficient number, since it is larger than the sum of its proper divisors (11652019107).

19420031805 is a wasteful number, since it uses less digits than its factorization.

19420031805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294668795.

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 19420031805 in words is "nineteen billion, four hundred twenty million, thirty-one thousand, eight hundred five".