19905767794 has 16 divisors (see below), whose sum is σ = 33696285120. Its totient is φ = 8736073360.

The previous prime is 19905767779. The next prime is 19905767801. The reversal of 19905767794 is 49776750991.

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, 15599494 + ... + 15600769.

It is an arithmetic number, because the mean of its divisors is an integer number (2106017820).

Almost surely, 2^19905767794 is an apocalyptic number.

19905767794 is a deficient number, since it is larger than the sum of its proper divisors (13790517326).

19905767794 is a wasteful number, since it uses less digits than its factorization.

19905767794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31200305.

The product of its (nonzero) digits is 30005640, while the sum is 64.

The spelling of 19905767794 in words is "nineteen billion, nine hundred five million, seven hundred sixty-seven thousand, seven hundred ninety-four".