20057239 has 2 divisors, whose sum is σ = 20057240. Its totient is φ = 20057238.

The previous prime is 20057197. The next prime is 20057243. The reversal of 20057239 is 93275002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20057239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20057249) 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, 10028619 + 10028620.

It is an arithmetic number, because the mean of its divisors is an integer number (10028620).

Almost surely, 2^20057239 is an apocalyptic number.

20057239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20057239 is an equidigital number, since it uses as much as digits as its factorization.

20057239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 20057239 is about 4478.5308975154. The cubic root of 20057239 is about 271.7004659333.

The spelling of 20057239 in words is "twenty million, fifty-seven thousand, two hundred thirty-nine".