20021320223 has 4 divisors (see below), whose sum is σ = 21199044960. Its totient is φ = 18843595488.

The previous prime is 20021320217. The next prime is 20021320247. The reversal of 20021320223 is 32202312002.

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

It is a cyclic number.

It is not a de Polignac number, because 20021320223 - 2¹² = 20021316127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1177724719 = 20021320223 / (2 + 0 + 0 + 2 + 1 + 3 + 2 + 0 + 2 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021340223) 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, 588862343 + ... + 588862376.

It is an arithmetic number, because the mean of its divisors is an integer number (5299761240).

Almost surely, 2^20021320223 is an apocalyptic number.

20021320223 is a deficient number, since it is larger than the sum of its proper divisors (1177724737).

20021320223 is a wasteful number, since it uses less digits than its factorization.

20021320223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177724736.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20021320223 its reverse (32202312002), we get a palindrome (52223632225).

The spelling of 20021320223 in words is "twenty billion, twenty-one million, three hundred twenty thousand, two hundred twenty-three".