20102197 has 4 divisors (see below), whose sum is σ = 20290176. Its totient is φ = 19914220.

The previous prime is 20102153. The next prime is 20102213. The reversal of 20102197 is 79120102.

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 20102197 - 2¹¹ = 20100149 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 (20102497) 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, 93829 + ... + 94042.

It is an arithmetic number, because the mean of its divisors is an integer number (5072544).

Almost surely, 2^20102197 is an apocalyptic number.

It is an amenable number.

20102197 is a deficient number, since it is larger than the sum of its proper divisors (187979).

20102197 is a wasteful number, since it uses less digits than its factorization.

20102197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187978.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 20102197 is about 4483.5473678774. The cubic root of 20102197 is about 271.9033186163.

Adding to 20102197 its reverse (79120102), we get a palindrome (99222299).

The spelling of 20102197 in words is "twenty million, one hundred two thousand, one hundred ninety-seven".