20531322443 has 2 divisors, whose sum is σ = 20531322444. Its totient is φ = 20531322442.

The previous prime is 20531322421. The next prime is 20531322463. The reversal of 20531322443 is 34422313502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20531322443 - 2³² = 16236355147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20531322463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265661221 + 10265661222.

It is an arithmetic number, because the mean of its divisors is an integer number (10265661222).

Almost surely, 2^20531322443 is an apocalyptic number.

20531322443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531322443 is an equidigital number, since it uses as much as digits as its factorization.

20531322443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 20531322443 its reverse (34422313502), we get a palindrome (54953635945).

The spelling of 20531322443 in words is "twenty billion, five hundred thirty-one million, three hundred twenty-two thousand, four hundred forty-three".