20729147099 has 4 divisors (see below), whose sum is σ = 21120263136. Its totient is φ = 20338031064.

The previous prime is 20729147071. The next prime is 20729147111. The reversal of 20729147099 is 99074192702.

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 20729147099 - 2¹² = 20729143003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20729147009) 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, 195557939 + ... + 195558044.

It is an arithmetic number, because the mean of its divisors is an integer number (5280065784).

Almost surely, 2^20729147099 is an apocalyptic number.

20729147099 is a deficient number, since it is larger than the sum of its proper divisors (391116037).

20729147099 is an equidigital number, since it uses as much as digits as its factorization.

20729147099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391116036.

The product of its (nonzero) digits is 571536, while the sum is 50.

The spelling of 20729147099 in words is "twenty billion, seven hundred twenty-nine million, one hundred forty-seven thousand, ninety-nine".