20313340321 has 4 divisors (see below), whose sum is σ = 20459479600. Its totient is φ = 20167201044.

The previous prime is 20313340253. The next prime is 20313340339. The reversal of 20313340321 is 12304331302.

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 20313340321 - 2¹³ = 20313332129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20313340292 and 20313340301.

It is not an unprimeable number, because it can be changed into a prime (20313340381) 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, 73069431 + ... + 73069708.

It is an arithmetic number, because the mean of its divisors is an integer number (5114869900).

Almost surely, 2^20313340321 is an apocalyptic number.

It is an amenable number.

20313340321 is a deficient number, since it is larger than the sum of its proper divisors (146139279).

20313340321 is a wasteful number, since it uses less digits than its factorization.

20313340321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146139278.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 20313340321 its reverse (12304331302), we get a palindrome (32617671623).

The spelling of 20313340321 in words is "twenty billion, three hundred thirteen million, three hundred forty thousand, three hundred twenty-one".