20740259 has 2 divisors, whose sum is σ = 20740260. Its totient is φ = 20740258.

The previous prime is 20740253. The next prime is 20740261. The reversal of 20740259 is 95204702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20740259 - 2⁸ = 20740003 is a prime.

Together with 20740261, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20740253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370129 + 10370130.

It is an arithmetic number, because the mean of its divisors is an integer number (10370130).

Almost surely, 2^20740259 is an apocalyptic number.

20740259 is a deficient number, since it is larger than the sum of its proper divisors (1).

20740259 is an equidigital number, since it uses as much as digits as its factorization.

20740259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20740259 is about 4554.1474504017. The cubic root of 20740259 is about 274.7502260994.

The spelling of 20740259 in words is "twenty million, seven hundred forty thousand, two hundred fifty-nine".