20202439 has 2 divisors, whose sum is σ = 20202440. Its totient is φ = 20202438.

The previous prime is 20202437. The next prime is 20202451. The reversal of 20202439 is 93420202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20202439 - 2¹ = 20202437 is a prime.

Together with 20202437, it forms a pair of twin primes.

20202439 is a modest number, since divided by 2439 gives 202 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101219 + 10101220.

It is an arithmetic number, because the mean of its divisors is an integer number (10101220).

Almost surely, 2^20202439 is an apocalyptic number.

20202439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202439 is an equidigital number, since it uses as much as digits as its factorization.

20202439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20202439 is about 4494.7123378477. The cubic root of 20202439 is about 272.3545288703.

The spelling of 20202439 in words is "twenty million, two hundred two thousand, four hundred thirty-nine".