20302231231 has 4 divisors (see below), whose sum is σ = 21002308200. Its totient is φ = 19602154264.

The previous prime is 20302231189. The next prime is 20302231247. The reversal of 20302231231 is 13213220302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20302231231 is a prime.

It is a super-2 number, since 2×20302231231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20302231199 and 20302231208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20302231331) 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, 350038441 + ... + 350038498.

It is an arithmetic number, because the mean of its divisors is an integer number (5250577050).

Almost surely, 2^20302231231 is an apocalyptic number.

20302231231 is a deficient number, since it is larger than the sum of its proper divisors (700076969).

20302231231 is an equidigital number, since it uses as much as digits as its factorization.

20302231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700076968.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20302231231 its reverse (13213220302), we get a palindrome (33515451533).

The spelling of 20302231231 in words is "twenty billion, three hundred two million, two hundred thirty-one thousand, two hundred thirty-one".