20665567013 has 32 divisors (see below), whose sum is σ = 26948630016. Its totient is φ = 15378720768.

The previous prime is 20665567009. The next prime is 20665567031. The reversal of 20665567013 is 31076556602.

It is a cyclic number.

It is not a de Polignac number, because 20665567013 - 2² = 20665567009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665567063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2955920 + ... + 2962902.

It is an arithmetic number, because the mean of its divisors is an integer number (842144688).

Almost surely, 2^20665567013 is an apocalyptic number.

It is an amenable number.

20665567013 is a deficient number, since it is larger than the sum of its proper divisors (6283063003).

20665567013 is a wasteful number, since it uses less digits than its factorization.

20665567013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8933.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 20665567013 in words is "twenty billion, six hundred sixty-five million, five hundred sixty-seven thousand, thirteen".