20205097 has 4 divisors (see below), whose sum is σ = 22041936. Its totient is φ = 18368260.

The previous prime is 20205077. The next prime is 20205103. The reversal of 20205097 is 79050202.

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 20205097 - 2¹¹ = 20203049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20205077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918403 + ... + 918424.

It is an arithmetic number, because the mean of its divisors is an integer number (5510484).

Almost surely, 2^20205097 is an apocalyptic number.

It is an amenable number.

20205097 is a deficient number, since it is larger than the sum of its proper divisors (1836839).

20205097 is a wasteful number, since it uses less digits than its factorization.

20205097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836838.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20205097 is about 4495.0080088916. The cubic root of 20205097 is about 272.3664727514.

Adding to 20205097 its reverse (79050202), we get a palindrome (99255299).

It can be divided in two parts, 2020 and 5097, that added together give a palindrome (7117).

The spelling of 20205097 in words is "twenty million, two hundred five thousand, ninety-seven".