20729145269 has 12 divisors (see below), whose sum is σ = 24701631948. Its totient is φ = 17334475200.

The previous prime is 20729145263. The next prime is 20729145289. The reversal of 20729145269 is 96254192702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8581799044 + 12147346225 = 92638^2 + 110215^2 .

It is not a de Polignac number, because 20729145269 - 2⁸ = 20729145013 is a prime.

It is a super-2 number, since 2×20729145269² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20729145263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5157062 + ... + 5161079.

It is an arithmetic number, because the mean of its divisors is an integer number (2058469329).

Almost surely, 2^20729145269 is an apocalyptic number.

It is an amenable number.

20729145269 is a deficient number, since it is larger than the sum of its proper divisors (3972486679).

20729145269 is a wasteful number, since it uses less digits than its factorization.

20729145269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10318196 (or 10318189 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 20729145269 in words is "twenty billion, seven hundred twenty-nine million, one hundred forty-five thousand, two hundred sixty-nine".