19920158197 has 8 divisors (see below), whose sum is σ = 20419584192. Its totient is φ = 19421378400.

The previous prime is 19920158123. The next prime is 19920158303. The reversal of 19920158197 is 79185102991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19920158197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19920158107) 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, 98823 + ... + 222724.

It is an arithmetic number, because the mean of its divisors is an integer number (2552448024).

Almost surely, 2^19920158197 is an apocalyptic number.

It is an amenable number.

19920158197 is a deficient number, since it is larger than the sum of its proper divisors (499425995).

19920158197 is a wasteful number, since it uses less digits than its factorization.

19920158197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323099.

The product of its (nonzero) digits is 408240, while the sum is 52.

The spelling of 19920158197 in words is "nineteen billion, nine hundred twenty million, one hundred fifty-eight thousand, one hundred ninety-seven".