20534729669 has 4 divisors (see below), whose sum is σ = 20620649280. Its totient is φ = 20448810060.

The previous prime is 20534729653. The next prime is 20534729713. The reversal of 20534729669 is 96692743502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20534729669 - 2⁴ = 20534729653 is a prime.

It is a super-2 number, since 2×20534729669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20534729669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534729609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42959447 + ... + 42959924.

It is an arithmetic number, because the mean of its divisors is an integer number (5155162320).

Almost surely, 2^20534729669 is an apocalyptic number.

It is an amenable number.

20534729669 is a deficient number, since it is larger than the sum of its proper divisors (85919611).

20534729669 is an equidigital number, since it uses as much as digits as its factorization.

20534729669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85919610.

The product of its (nonzero) digits is 4898880, while the sum is 53.

The spelling of 20534729669 in words is "twenty billion, five hundred thirty-four million, seven hundred twenty-nine thousand, six hundred sixty-nine".