20323221131 has 4 divisors (see below), whose sum is σ = 20336309112. Its totient is φ = 20310133152.

The previous prime is 20323221067. The next prime is 20323221137. The reversal of 20323221131 is 13112232302.

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 20323221131 - 2⁶ = 20323221067 is a prime.

It is a super-2 number, since 2×20323221131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20323221137) 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, 6541661 + ... + 6544766.

It is an arithmetic number, because the mean of its divisors is an integer number (5084077278).

Almost surely, 2^20323221131 is an apocalyptic number.

20323221131 is a deficient number, since it is larger than the sum of its proper divisors (13087981).

20323221131 is a wasteful number, since it uses less digits than its factorization.

20323221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13087980.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20323221131 its reverse (13112232302), we get a palindrome (33435453433).

The spelling of 20323221131 in words is "twenty billion, three hundred twenty-three million, two hundred twenty-one thousand, one hundred thirty-one".