20258939 has 2 divisors, whose sum is σ = 20258940. Its totient is φ = 20258938.

The previous prime is 20258923. The next prime is 20258947. The reversal of 20258939 is 93985202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20258939 - 2⁴ = 20258923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20258969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10129469 + 10129470.

It is an arithmetic number, because the mean of its divisors is an integer number (10129470).

Almost surely, 2^20258939 is an apocalyptic number.

20258939 is a deficient number, since it is larger than the sum of its proper divisors (1).

20258939 is an equidigital number, since it uses as much as digits as its factorization.

20258939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 20258939 is about 4500.9931126364. The cubic root of 20258939 is about 272.6081897926.

The spelling of 20258939 in words is "twenty million, two hundred fifty-eight thousand, nine hundred thirty-nine".