20173919497 has 8 divisors (see below), whose sum is σ = 20670515712. Its totient is φ = 19677540000.

The previous prime is 20173919483. The next prime is 20173919509. The reversal of 20173919497 is 79491937102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20173919497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20173911497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143008 + ... + 246574.

It is an arithmetic number, because the mean of its divisors is an integer number (2583814464).

Almost surely, 2^20173919497 is an apocalyptic number.

It is an amenable number.

20173919497 is a deficient number, since it is larger than the sum of its proper divisors (496596215).

20173919497 is a wasteful number, since it uses less digits than its factorization.

20173919497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108359.

The product of its (nonzero) digits is 857304, while the sum is 52.

The spelling of 20173919497 in words is "twenty billion, one hundred seventy-three million, nine hundred nineteen thousand, four hundred ninety-seven".