20348957813 has 4 divisors (see below), whose sum is σ = 20351420448. Its totient is φ = 20346495180.

The previous prime is 20348957809. The next prime is 20348957903. The reversal of 20348957813 is 31875984302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20348957813 - 2² = 20348957809 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 (20348957413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1218881 + ... + 1235462.

It is an arithmetic number, because the mean of its divisors is an integer number (5087855112).

Almost surely, 2^20348957813 is an apocalyptic number.

It is an amenable number.

20348957813 is a deficient number, since it is larger than the sum of its proper divisors (2462635).

20348957813 is an equidigital number, since it uses as much as digits as its factorization.

20348957813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462634.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 20348957813 in words is "twenty billion, three hundred forty-eight million, nine hundred fifty-seven thousand, eight hundred thirteen".