19520197 has 4 divisors (see below), whose sum is σ = 19543680. Its totient is φ = 19496716.

The previous prime is 19520191. The next prime is 19520231. The reversal of 19520197 is 79102591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19520197 - 2⁷ = 19520069 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 (19520191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10447 + ... + 12172.

It is an arithmetic number, because the mean of its divisors is an integer number (4885920).

Almost surely, 2^19520197 is an apocalyptic number.

It is an amenable number.

19520197 is a deficient number, since it is larger than the sum of its proper divisors (23483).

19520197 is an equidigital number, since it uses as much as digits as its factorization.

19520197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23482.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 19520197 is about 4418.1667012461. The cubic root of 19520197 is about 269.2535256725.

The spelling of 19520197 in words is "nineteen million, five hundred twenty thousand, one hundred ninety-seven".