20303020021 has 4 divisors (see below), whose sum is σ = 20303505792. Its totient is φ = 20302534252.

The previous prime is 20303019967. The next prime is 20303020063. The reversal of 20303020021 is 12002030302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20303020021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20303019983 and 20303020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303020091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173605 + ... + 265978.

It is an arithmetic number, because the mean of its divisors is an integer number (5075876448).

Almost surely, 2^20303020021 is an apocalyptic number.

It is an amenable number.

20303020021 is a deficient number, since it is larger than the sum of its proper divisors (485771).

20303020021 is an equidigital number, since it uses as much as digits as its factorization.

20303020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485770.

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 20303020021 its reverse (12002030302), we get a palindrome (32305050323).

The spelling of 20303020021 in words is "twenty billion, three hundred three million, twenty thousand, twenty-one".