19894817086 has 16 divisors (see below), whose sum is σ = 31763093760. Its totient is φ = 9313246720.

The previous prime is 19894817077. The next prime is 19894817099. The reversal of 19894817086 is 68071849891.

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 in 7 ways as a sum of consecutive naturals, for example, 1525291 + ... + 1538278.

It is an arithmetic number, because the mean of its divisors is an integer number (1985193360).

Almost surely, 2^19894817086 is an apocalyptic number.

19894817086 is a deficient number, since it is larger than the sum of its proper divisors (11868276674).

19894817086 is a wasteful number, since it uses less digits than its factorization.

19894817086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063779.

The product of its (nonzero) digits is 6967296, while the sum is 61.

The spelling of 19894817086 in words is "nineteen billion, eight hundred ninety-four million, eight hundred seventeen thousand, eighty-six".