20329403661943 has 2 divisors, whose sum is σ = 20329403661944. Its totient is φ = 20329403661942.

The previous prime is 20329403661811. The next prime is 20329403661979. The reversal of 20329403661943 is 34916630492302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20329403661943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20329403661443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10164701830971 + 10164701830972.

It is an arithmetic number, because the mean of its divisors is an integer number (10164701830972).

Almost surely, 2^{20329403661943} is an apocalyptic number.

20329403661943 is a deficient number, since it is larger than the sum of its proper divisors (1).

20329403661943 is an equidigital number, since it uses as much as digits as its factorization.

20329403661943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5038848, while the sum is 52.

The spelling of 20329403661943 in words is "twenty trillion, three hundred twenty-nine billion, four hundred three million, six hundred sixty-one thousand, nine hundred forty-three".