20729089399 has 4 divisors (see below), whose sum is σ = 20733281200. Its totient is φ = 20724897600.

The previous prime is 20729089391. The next prime is 20729089429. The reversal of 20729089399 is 99398092702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20729089399 - 2³ = 20729089391 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 (20729089391) 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, 2088474 + ... + 2098375.

It is an arithmetic number, because the mean of its divisors is an integer number (5183320300).

Almost surely, 2^20729089399 is an apocalyptic number.

20729089399 is a deficient number, since it is larger than the sum of its proper divisors (4191801).

20729089399 is an equidigital number, since it uses as much as digits as its factorization.

20729089399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191800.

The product of its (nonzero) digits is 4408992, while the sum is 58.

The spelling of 20729089399 in words is "twenty billion, seven hundred twenty-nine million, eighty-nine thousand, three hundred ninety-nine".