20205567 has 6 divisors (see below), whose sum is σ = 29185832. Its totient is φ = 13470372.

The previous prime is 20205557. The next prime is 20205587. The reversal of 20205567 is 76550202.

It is not a de Polignac number, because 20205567 - 2⁴ = 20205551 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20205567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1122523 + ... + 1122540.

Almost surely, 2^20205567 is an apocalyptic number.

20205567 is a deficient number, since it is larger than the sum of its proper divisors (8980265).

20205567 is a wasteful number, since it uses less digits than its factorization.

20205567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245069 (or 2245066 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20205567 is about 4495.0602888059. The cubic root of 20205567 is about 272.3685846154.

Adding to 20205567 its reverse (76550202), we get a palindrome (96755769).

The spelling of 20205567 in words is "twenty million, two hundred five thousand, five hundred sixty-seven".