20045323421 has 16 divisors (see below), whose sum is σ = 21188874240. Its totient is φ = 18932363520.

The previous prime is 20045323411. The next prime is 20045323427. The reversal of 20045323421 is 12432354002.

It is a cyclic number.

It is not a de Polignac number, because 20045323421 - 2¹⁰ = 20045322397 is a prime.

It is a super-2 number, since 2×20045323421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045323427) 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 15 ways as a sum of consecutive naturals, for example, 4619765 + ... + 4624101.

It is an arithmetic number, because the mean of its divisors is an integer number (1324304640).

Almost surely, 2^20045323421 is an apocalyptic number.

It is an amenable number.

20045323421 is a deficient number, since it is larger than the sum of its proper divisors (1143550819).

20045323421 is a wasteful number, since it uses less digits than its factorization.

20045323421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7804.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 20045323421 its reverse (12432354002), we get a palindrome (32477677423).

The spelling of 20045323421 in words is "twenty billion, forty-five million, three hundred twenty-three thousand, four hundred twenty-one".