20005197 has 12 divisors (see below), whose sum is σ = 27419616. Its totient is φ = 12973680.

The previous prime is 20005177. The next prime is 20005207. The reversal of 20005197 is 79150002.

It is not a de Polignac number, because 20005197 - 2¹¹ = 20003149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1672 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (2284968).

Almost surely, 2^20005197 is an apocalyptic number.

It is an amenable number.

20005197 is a deficient number, since it is larger than the sum of its proper divisors (7414419).

20005197 is an equidigital number, since it uses as much as digits as its factorization.

20005197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4948 (or 4911 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 20005197 is about 4472.7169595225. The cubic root of 20005197 is about 271.4652710039.

Adding to 20005197 its reverse (79150002), we get a palindrome (99155199).

It can be divided in two parts, 20005 and 197, that added together give a palindrome (20202).

The spelling of 20005197 in words is "twenty million, five thousand, one hundred ninety-seven".