20205109065 has 16 divisors (see below), whose sum is σ = 32630309568. Its totient is φ = 10675346496.

The previous prime is 20205109063. The next prime is 20205109151. The reversal of 20205109065 is 56090150202.

It is a happy number.

It is not a de Polignac number, because 20205109065 - 2¹ = 20205109063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20205109063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6292822 + ... + 6296031.

It is an arithmetic number, because the mean of its divisors is an integer number (2039394348).

Almost surely, 2^20205109065 is an apocalyptic number.

It is an amenable number.

20205109065 is a deficient number, since it is larger than the sum of its proper divisors (12425200503).

20205109065 is a wasteful number, since it uses less digits than its factorization.

20205109065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12588968.

The product of its (nonzero) digits is 5400, while the sum is 30.

Adding to 20205109065 its reverse (56090150202), we get a palindrome (76295259267).

The spelling of 20205109065 in words is "twenty billion, two hundred five million, one hundred nine thousand, sixty-five".