20411239 has 2 divisors, whose sum is σ = 20411240. Its totient is φ = 20411238.

The previous prime is 20411233. The next prime is 20411243. The reversal of 20411239 is 93211402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20411239 is a prime.

It is equal to p_1295005 and since 20411239 and 1295005 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20411233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10205619 + 10205620.

It is an arithmetic number, because the mean of its divisors is an integer number (10205620).

Almost surely, 2^20411239 is an apocalyptic number.

20411239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20411239 is an equidigital number, since it uses as much as digits as its factorization.

20411239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20411239 is about 4517.8799231498. The cubic root of 20411239 is about 273.2896111241.

The spelling of 20411239 in words is "twenty million, four hundred eleven thousand, two hundred thirty-nine".