20531443459 has 2 divisors, whose sum is σ = 20531443460. Its totient is φ = 20531443458.

The previous prime is 20531443423. The next prime is 20531443463. The reversal of 20531443459 is 95434413502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20531443459 - 2¹⁷ = 20531312387 is a prime.

It is a super-2 number, since 2×20531443459² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20531443469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265721729 + 10265721730.

It is an arithmetic number, because the mean of its divisors is an integer number (10265721730).

Almost surely, 2^20531443459 is an apocalyptic number.

20531443459 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531443459 is an equidigital number, since it uses as much as digits as its factorization.

20531443459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 20531443459 in words is "twenty billion, five hundred thirty-one million, four hundred forty-three thousand, four hundred fifty-nine".