20252539 has 2 divisors, whose sum is σ = 20252540. Its totient is φ = 20252538.

The previous prime is 20252521. The next prime is 20252543. The reversal of 20252539 is 93525202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20252539 - 2⁹ = 20252027 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20252509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10126269 + 10126270.

It is an arithmetic number, because the mean of its divisors is an integer number (10126270).

Almost surely, 2^20252539 is an apocalyptic number.

20252539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20252539 is an equidigital number, since it uses as much as digits as its factorization.

20252539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 20252539 is about 4500.2821022687. The cubic root of 20252539 is about 272.5794802245.

The spelling of 20252539 in words is "twenty million, two hundred fifty-two thousand, five hundred thirty-nine".