20605339 has 2 divisors, whose sum is σ = 20605340. Its totient is φ = 20605338.

The previous prime is 20605327. The next prime is 20605349. The reversal of 20605339 is 93350602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20605339 - 2⁹ = 20604827 is a prime.

It is not a weakly prime, because it can be changed into another prime (20605349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302669 + 10302670.

It is an arithmetic number, because the mean of its divisors is an integer number (10302670).

Almost surely, 2^20605339 is an apocalyptic number.

20605339 is a deficient number, since it is larger than the sum of its proper divisors (1).

20605339 is an equidigital number, since it uses as much as digits as its factorization.

20605339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 20605339 is about 4539.3104101835. The cubic root of 20605339 is about 274.1531590840.

The spelling of 20605339 in words is "twenty million, six hundred five thousand, three hundred thirty-nine".