20531630323 has 2 divisors, whose sum is σ = 20531630324. Its totient is φ = 20531630322.

The previous prime is 20531630321. The next prime is 20531630333. The reversal of 20531630323 is 32303613502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20531630323 - 2¹ = 20531630321 is a prime.

Together with 20531630321, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20531630291 and 20531630300.

It is not a weakly prime, because it can be changed into another prime (20531630321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265815161 + 10265815162.

It is an arithmetic number, because the mean of its divisors is an integer number (10265815162).

Almost surely, 2^20531630323 is an apocalyptic number.

20531630323 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531630323 is an equidigital number, since it uses as much as digits as its factorization.

20531630323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 28.

The spelling of 20531630323 in words is "twenty billion, five hundred thirty-one million, six hundred thirty thousand, three hundred twenty-three".