20729145296 has 20 divisors (see below), whose sum is σ = 42525232452. Its totient is φ = 9754891776.

The previous prime is 20729145289. The next prime is 20729145341. The reversal of 20729145296 is 69254192702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10168705600 + 10560439696 = 100840^2 + 102764^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20729145296.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38104775 + ... + 38105318.

Almost surely, 2^20729145296 is an apocalyptic number.

It is an amenable number.

20729145296 is an abundant number, since it is smaller than the sum of its proper divisors (21796087156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20729145296 is a wasteful number, since it uses less digits than its factorization.

20729145296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76210118 (or 76210112 counting only the distinct ones).

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

The spelling of 20729145296 in words is "twenty billion, seven hundred twenty-nine million, one hundred forty-five thousand, two hundred ninety-six".