19906304078 has 4 divisors (see below), whose sum is σ = 29859456120. Its totient is φ = 9953152038.

The previous prime is 19906304059. The next prime is 19906304213. The reversal of 19906304078 is 87040360991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87040360991 = 2039 ⋅42687769.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4976576018 + ... + 4976576021.

It is an arithmetic number, because the mean of its divisors is an integer number (7464864030).

Almost surely, 2^19906304078 is an apocalyptic number.

19906304078 is a deficient number, since it is larger than the sum of its proper divisors (9953152042).

19906304078 is an equidigital number, since it uses as much as digits as its factorization.

19906304078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9953152041.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 19906304078 in words is "nineteen billion, nine hundred six million, three hundred four thousand, seventy-eight".