20873434140869 has 2 divisors, whose sum is σ = 20873434140870. Its totient is φ = 20873434140868.

The previous prime is 20873434140851. The next prime is 20873434140899. The reversal of 20873434140869 is 96804143437802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12183101584900 + 8690332555969 = 3490430^2 + 2947937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20873434140869 is a prime.

It is a super-2 number, since 2×20873434140869² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20873434140899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10436717070434 + 10436717070435.

It is an arithmetic number, because the mean of its divisors is an integer number (10436717070435).

Almost surely, 2^{20873434140869} is an apocalyptic number.

It is an amenable number.

20873434140869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20873434140869 is an equidigital number, since it uses as much as digits as its factorization.

20873434140869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27869184, while the sum is 59.

The spelling of 20873434140869 in words is "twenty trillion, eight hundred seventy-three billion, four hundred thirty-four million, one hundred forty thousand, eight hundred sixty-nine".