19905676636 has 12 divisors (see below), whose sum is σ = 34836531912. Its totient is φ = 9952381808.

The previous prime is 19905676613. The next prime is 19905676639. The reversal of 19905676636 is 63667650991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19905676639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4270 + ... + 199573.

It is an arithmetic number, because the mean of its divisors is an integer number (2903044326).

Almost surely, 2^19905676636 is an apocalyptic number.

It is an amenable number.

19905676636 is a deficient number, since it is larger than the sum of its proper divisors (14930855276).

19905676636 is a wasteful number, since it uses less digits than its factorization.

19905676636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228260 (or 228258 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 58.

The spelling of 19905676636 in words is "nineteen billion, nine hundred five million, six hundred seventy-six thousand, six hundred thirty-six".