20562439 has 2 divisors, whose sum is σ = 20562440. Its totient is φ = 20562438.

The previous prime is 20562431. The next prime is 20562457. The reversal of 20562439 is 93426502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20562439 - 2³ = 20562431 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20562439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20562431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10281219 + 10281220.

It is an arithmetic number, because the mean of its divisors is an integer number (10281220).

Almost surely, 2^20562439 is an apocalyptic number.

20562439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20562439 is an equidigital number, since it uses as much as digits as its factorization.

20562439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 20562439 is about 4534.5825607215. The cubic root of 20562439 is about 273.9627659991.

The spelling of 20562439 in words is "twenty million, five hundred sixty-two thousand, four hundred thirty-nine".