20045311321 has 16 divisors (see below), whose sum is σ = 23307579648. Its totient is φ = 16883265600.

The previous prime is 20045311289. The next prime is 20045311361. The reversal of 20045311321 is 12311354002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20045311321 - 2⁵ = 20045311289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20045311292 and 20045311301.

It is not an unprimeable number, because it can be changed into a prime (20045311361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417471 + ... + 463003.

It is an arithmetic number, because the mean of its divisors is an integer number (1456723728).

Almost surely, 2^20045311321 is an apocalyptic number.

It is an amenable number.

20045311321 is a deficient number, since it is larger than the sum of its proper divisors (3262268327).

20045311321 is a wasteful number, since it uses less digits than its factorization.

20045311321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46632.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20045311321 its reverse (12311354002), we get a palindrome (32356665323).

The spelling of 20045311321 in words is "twenty billion, forty-five million, three hundred eleven thousand, three hundred twenty-one".