20199197 has 4 divisors (see below), whose sum is σ = 20850816. Its totient is φ = 19547580.

The previous prime is 20199191. The next prime is 20199203. The reversal of 20199197 is 79199102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79199102 = 2 ⋅39599551.

It is an interprime number because it is at equal distance from previous prime (20199191) and next prime (20199203).

It is a cyclic number.

It is not a de Polignac number, because 20199197 - 2⁶ = 20199133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20199197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20199191) 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, 325763 + ... + 325824.

It is an arithmetic number, because the mean of its divisors is an integer number (5212704).

Almost surely, 2^20199197 is an apocalyptic number.

It is an amenable number.

20199197 is a deficient number, since it is larger than the sum of its proper divisors (651619).

20199197 is an equidigital number, since it uses as much as digits as its factorization.

20199197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651618.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 20199197 is about 4494.3516773835. The cubic root of 20199197 is about 272.3399593321.

The spelling of 20199197 in words is "twenty million, one hundred ninety-nine thousand, one hundred ninety-seven".