20349947513 has 8 divisors (see below), whose sum is σ = 23263196928. Its totient is φ = 17438226624.

The previous prime is 20349947507. The next prime is 20349947581. The reversal of 20349947513 is 31574994302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20349947513 - 2²⁰ = 20348898937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20349947113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353456 + ... + 406977.

It is an arithmetic number, because the mean of its divisors is an integer number (2907899616).

Almost surely, 2^20349947513 is an apocalyptic number.

It is an amenable number.

20349947513 is a deficient number, since it is larger than the sum of its proper divisors (2913249415).

20349947513 is an equidigital number, since it uses as much as digits as its factorization.

20349947513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764263.

The product of its (nonzero) digits is 816480, while the sum is 47.

The spelling of 20349947513 in words is "twenty billion, three hundred forty-nine million, nine hundred forty-seven thousand, five hundred thirteen".