20123400932689 has 2 divisors, whose sum is σ = 20123400932690. Its totient is φ = 20123400932688.

The previous prime is 20123400932573. The next prime is 20123400932737. The reversal of 20123400932689 is 98623900432102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20116193771664 + 7207161025 = 4485108^2 + 84895^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123400932689 - 2²³ = 20123392544081 is a prime.

It is not a weakly prime, because it can be changed into another prime (20123400938689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061700466344 + 10061700466345.

It is an arithmetic number, because the mean of its divisors is an integer number (10061700466345).

Almost surely, 2^{20123400932689} is an apocalyptic number.

It is an amenable number.

20123400932689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123400932689 is an equidigital number, since it uses as much as digits as its factorization.

20123400932689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 20123400932689 in words is "twenty trillion, one hundred twenty-three billion, four hundred million, nine hundred thirty-two thousand, six hundred eighty-nine".