20605129567 has 6 divisors (see below), whose sum is σ = 22648613624. Its totient is φ = 18731935860.

The previous prime is 20605129529. The next prime is 20605129579. The reversal of 20605129567 is 76592150602.

It is not a de Polignac number, because 20605129567 - 2³¹ = 18457645919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20605129267) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85145043 + ... + 85145284.

Almost surely, 2^20605129567 is an apocalyptic number.

20605129567 is a deficient number, since it is larger than the sum of its proper divisors (2043484057).

20605129567 is a wasteful number, since it uses less digits than its factorization.

20605129567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170290349 (or 170290338 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 20605129567 in words is "twenty billion, six hundred five million, one hundred twenty-nine thousand, five hundred sixty-seven".