19896904609309 has 24 divisors (see below), whose sum is σ = 24951569774208. Its totient is φ = 15726325517280.

The previous prime is 19896904609261. The next prime is 19896904609367. The reversal of 19896904609309 is 90390640969891.

It is not a de Polignac number, because 19896904609309 - 2⁹ = 19896904608797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19896904609399) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15534657 + ... + 16766614.

It is an arithmetic number, because the mean of its divisors is an integer number (1039648740592).

Almost surely, 2^{19896904609309} is an apocalyptic number.

It is an amenable number.

19896904609309 is a deficient number, since it is larger than the sum of its proper divisors (5054665164899).

19896904609309 is a wasteful number, since it uses less digits than its factorization.

19896904609309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32302265 (or 32302258 counting only the distinct ones).

The product of its (nonzero) digits is 204073344, while the sum is 73.

The spelling of 19896904609309 in words is "nineteen trillion, eight hundred ninety-six billion, nine hundred four million, six hundred nine thousand, three hundred nine".