20320353121 has 12 divisors (see below), whose sum is σ = 20933458560. Its totient is φ = 19724708880.

The previous prime is 20320353103. The next prime is 20320353143. The reversal of 20320353121 is 12135302302.

It is not a de Polignac number, because 20320353121 - 2⁵ = 20320353089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20320353092 and 20320353101.

It is not an unprimeable number, because it can be changed into a prime (20320354121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 572820 + ... + 607258.

It is an arithmetic number, because the mean of its divisors is an integer number (1744454880).

Almost surely, 2^20320353121 is an apocalyptic number.

It is an amenable number.

20320353121 is a deficient number, since it is larger than the sum of its proper divisors (613105439).

20320353121 is an equidigital number, since it uses as much as digits as its factorization.

20320353121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34944 (or 34907 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 20320353121 its reverse (12135302302), we get a palindrome (32455655423).

The spelling of 20320353121 in words is "twenty billion, three hundred twenty million, three hundred fifty-three thousand, one hundred twenty-one".