20021320303 has 4 divisors (see below), whose sum is σ = 20021733360. Its totient is φ = 20020907248.

The previous prime is 20021320247. The next prime is 20021320321. The reversal of 20021320303 is 30302312002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30302312002 = 2 ⋅15151156001.

It is a cyclic number.

It is not a de Polignac number, because 20021320303 - 2³³ = 11431385711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021320703) 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 3 ways as a sum of consecutive naturals, for example, 122398 + ... + 234571.

It is an arithmetic number, because the mean of its divisors is an integer number (5005433340).

Almost surely, 2^20021320303 is an apocalyptic number.

20021320303 is a deficient number, since it is larger than the sum of its proper divisors (413057).

20021320303 is an equidigital number, since it uses as much as digits as its factorization.

20021320303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413056.

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

Adding to 20021320303 its reverse (30302312002), we get a palindrome (50323632305).

The spelling of 20021320303 in words is "twenty billion, twenty-one million, three hundred twenty thousand, three hundred three".