20205197 has 8 divisors (see below), whose sum is σ = 21616056. Its totient is φ = 18819072.

The previous prime is 20205193. The next prime is 20205223. The reversal of 20205197 is 79150202.

It can be written as a sum of positive squares in 4 ways, for example, as 4791721 + 15413476 = 2189^2 + 3926^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20205197 - 2² = 20205193 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 (20205193) 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, 4478 + ... + 7775.

It is an arithmetic number, because the mean of its divisors is an integer number (2702007).

Almost surely, 2^20205197 is an apocalyptic number.

It is an amenable number.

20205197 is a deficient number, since it is larger than the sum of its proper divisors (1410859).

20205197 is a wasteful number, since it uses less digits than its factorization.

20205197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12367.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 20205197 is about 4495.0191323286. The cubic root of 20205197 is about 272.3669220869.

Adding to 20205197 its reverse (79150202), we get a palindrome (99355399).

It can be divided in two parts, 20205 and 197, that added together give a palindrome (20402).

The spelling of 20205197 in words is "twenty million, two hundred five thousand, one hundred ninety-seven".