20205065 has 16 divisors (see below), whose sum is σ = 24993792. Its totient is φ = 15672384.

The previous prime is 20205041. The next prime is 20205077. The reversal of 20205065 is 56050202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20205065 - 2⁶ = 20205001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29507 + ... + 30183.

It is an arithmetic number, because the mean of its divisors is an integer number (1562112).

Almost surely, 2^20205065 is an apocalyptic number.

It is an amenable number.

20205065 is a deficient number, since it is larger than the sum of its proper divisors (4788727).

20205065 is a wasteful number, since it uses less digits than its factorization.

20205065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20205065 is about 4495.0044493860. The cubic root of 20205065 is about 272.3663289637.

Adding to 20205065 its reverse (56050202), we get a palindrome (76255267).

The spelling of 20205065 in words is "twenty million, two hundred five thousand, sixty-five".