20531022529 has 2 divisors, whose sum is σ = 20531022530. Its totient is φ = 20531022528.

The previous prime is 20531022521. The next prime is 20531022539. The reversal of 20531022529 is 92522013502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18838111504 + 1692911025 = 137252^2 + 41145^2 .

It is a cyclic number.

It is not a de Polignac number, because 20531022529 - 2³ = 20531022521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20531022529.

It is not a weakly prime, because it can be changed into another prime (20531022521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265511264 + 10265511265.

It is an arithmetic number, because the mean of its divisors is an integer number (10265511265).

Almost surely, 2^20531022529 is an apocalyptic number.

It is an amenable number.

20531022529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531022529 is an equidigital number, since it uses as much as digits as its factorization.

20531022529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 20531022529 in words is "twenty billion, five hundred thirty-one million, twenty-two thousand, five hundred twenty-nine".