20651339 has 2 divisors, whose sum is σ = 20651340. Its totient is φ = 20651338.

The previous prime is 20651329. The next prime is 20651341. The reversal of 20651339 is 93315602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20651339 is a prime.

Together with 20651341, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20651329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10325669 + 10325670.

It is an arithmetic number, because the mean of its divisors is an integer number (10325670).

Almost surely, 2^20651339 is an apocalyptic number.

20651339 is a deficient number, since it is larger than the sum of its proper divisors (1).

20651339 is an equidigital number, since it uses as much as digits as its factorization.

20651339 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 29.

The square root of 20651339 is about 4544.3744343969. The cubic root of 20651339 is about 274.3570168076.

The spelling of 20651339 in words is "twenty million, six hundred fifty-one thousand, three hundred thirty-nine".