20430312231 has 16 divisors (see below), whose sum is σ = 31338080768. Its totient is φ = 11597148000.

The previous prime is 20430312209. The next prime is 20430312239. The reversal of 20430312231 is 13221303402.

It is not a de Polignac number, because 20430312231 - 2⁷ = 20430312103 is a prime.

It is a super-2 number, since 2×20430312231² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20430312198 and 20430312207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430312239) 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 15 ways as a sum of consecutive naturals, for example, 3218260 + ... + 3224601.

It is an arithmetic number, because the mean of its divisors is an integer number (1958630048).

Almost surely, 2^20430312231 is an apocalyptic number.

20430312231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20430312231 is a deficient number, since it is larger than the sum of its proper divisors (10907768537).

20430312231 is a wasteful number, since it uses less digits than its factorization.

20430312231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6443022.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20430312231 its reverse (13221303402), we get a palindrome (33651615633).

The spelling of 20430312231 in words is "twenty billion, four hundred thirty million, three hundred twelve thousand, two hundred thirty-one".