20665298939 has 2 divisors, whose sum is σ = 20665298940. Its totient is φ = 20665298938.

The previous prime is 20665298881. The next prime is 20665298999. The reversal of 20665298939 is 93989256602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20665298939 - 2⁸ = 20665298683 is a prime.

It is not a weakly prime, because it can be changed into another prime (20665298999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10332649469 + 10332649470.

It is an arithmetic number, because the mean of its divisors is an integer number (10332649470).

Almost surely, 2^20665298939 is an apocalyptic number.

20665298939 is a deficient number, since it is larger than the sum of its proper divisors (1).

20665298939 is an equidigital number, since it uses as much as digits as its factorization.

20665298939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12597120, while the sum is 59.

The spelling of 20665298939 in words is "twenty billion, six hundred sixty-five million, two hundred ninety-eight thousand, nine hundred thirty-nine".