20612239 has 2 divisors, whose sum is σ = 20612240. Its totient is φ = 20612238.

The previous prime is 20612237. The next prime is 20612269. The reversal of 20612239 is 93221602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20612239 - 2¹ = 20612237 is a prime.

Together with 20612237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20612231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306119 + 10306120.

It is an arithmetic number, because the mean of its divisors is an integer number (10306120).

Almost surely, 2^20612239 is an apocalyptic number.

20612239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20612239 is an equidigital number, since it uses as much as digits as its factorization.

20612239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20612239 is about 4540.0703739039. The cubic root of 20612239 is about 274.1837570711.

The spelling of 20612239 in words is "twenty million, six hundred twelve thousand, two hundred thirty-nine".