20343765997 has 2 divisors, whose sum is σ = 20343765998. Its totient is φ = 20343765996.

The previous prime is 20343765947. The next prime is 20343766007. The reversal of 20343765997 is 79956734302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20342175876 + 1590121 = 142626^2 + 1261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20343765997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20343765947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10171882998 + 10171882999.

It is an arithmetic number, because the mean of its divisors is an integer number (10171882999).

Almost surely, 2^20343765997 is an apocalyptic number.

It is an amenable number.

20343765997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20343765997 is an equidigital number, since it uses as much as digits as its factorization.

20343765997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8573040, while the sum is 55.

The spelling of 20343765997 in words is "twenty billion, three hundred forty-three million, seven hundred sixty-five thousand, nine hundred ninety-seven".