20302330021 has 4 divisors (see below), whose sum is σ = 20797508844. Its totient is φ = 19807151200.

The previous prime is 20302330007. The next prime is 20302330039. The reversal of 20302330021 is 12003320302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12074932996 + 8227397025 = 109886^2 + 90705^2 .

It is a cyclic number.

It is not a de Polignac number, because 20302330021 - 2¹³ = 20302321829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20302329977 and 20302330004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20302337021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247589350 + ... + 247589431.

It is an arithmetic number, because the mean of its divisors is an integer number (5199377211).

Almost surely, 2^20302330021 is an apocalyptic number.

It is an amenable number.

20302330021 is a deficient number, since it is larger than the sum of its proper divisors (495178823).

20302330021 is an equidigital number, since it uses as much as digits as its factorization.

20302330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495178822.

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 20302330021 its reverse (12003320302), we get a palindrome (32305650323).

The spelling of 20302330021 in words is "twenty billion, three hundred two million, three hundred thirty thousand, twenty-one".