20351340321 has 8 divisors (see below), whose sum is σ = 29222437440. Its totient is φ = 12523901712.

The previous prime is 20351340313. The next prime is 20351340323. The reversal of 20351340321 is 12304315302.

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

It is not a de Polignac number, because 20351340321 - 2³ = 20351340313 is a prime.

It is a super-2 number, since 2×20351340321² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20351340291 and 20351340300.

It is not an unprimeable number, because it can be changed into a prime (20351340323) 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, 260914581 + ... + 260914658.

It is an arithmetic number, because the mean of its divisors is an integer number (3652804680).

Almost surely, 2^20351340321 is an apocalyptic number.

It is an amenable number.

20351340321 is a deficient number, since it is larger than the sum of its proper divisors (8871097119).

20351340321 is a wasteful number, since it uses less digits than its factorization.

20351340321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521829255.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 20351340321 its reverse (12304315302), we get a palindrome (32655655623).

The spelling of 20351340321 in words is "twenty billion, three hundred fifty-one million, three hundred forty thousand, three hundred twenty-one".