20042459 has 2 divisors, whose sum is σ = 20042460. Its totient is φ = 20042458.

The previous prime is 20042443. The next prime is 20042467. The reversal of 20042459 is 95424002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20042459 - 2⁴ = 20042443 is a prime.

It is not a weakly prime, because it can be changed into another prime (20042479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021229 + 10021230.

It is an arithmetic number, because the mean of its divisors is an integer number (10021230).

Almost surely, 2^20042459 is an apocalyptic number.

20042459 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042459 is an equidigital number, since it uses as much as digits as its factorization.

20042459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20042459 is about 4476.8804987402. The cubic root of 20042459 is about 271.6337116527.

The spelling of 20042459 in words is "twenty million, forty-two thousand, four hundred fifty-nine".