20332320021 has 72 divisors (see below), whose sum is σ = 33181293600. Its totient is φ = 11923433280.

The previous prime is 20332320017. The next prime is 20332320049. The reversal of 20332320021 is 12002323302.

It is a happy number.

It is not a de Polignac number, because 20332320021 - 2² = 20332320017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20332319976 and 20332320003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20332320061) 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 71 ways as a sum of consecutive naturals, for example, 7531930 + ... + 7534628.

It is an arithmetic number, because the mean of its divisors is an integer number (460851300).

Almost surely, 2^20332320021 is an apocalyptic number.

It is an amenable number.

20332320021 is a deficient number, since it is larger than the sum of its proper divisors (12848973579).

20332320021 is a wasteful number, since it uses less digits than its factorization.

20332320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2847 (or 2813 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 20332320021 its reverse (12002323302), we get a palindrome (32334643323).

The spelling of 20332320021 in words is "twenty billion, three hundred thirty-two million, three hundred twenty thousand, twenty-one".