20123142997 has 2 divisors, whose sum is σ = 20123142998. Its totient is φ = 20123142996.

The previous prime is 20123142983. The next prime is 20123143021. The reversal of 20123142997 is 79924132102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18980297361 + 1142845636 = 137769^2 + 33806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123142997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123142917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061571498 + 10061571499.

It is an arithmetic number, because the mean of its divisors is an integer number (10061571499).

Almost surely, 2^20123142997 is an apocalyptic number.

It is an amenable number.

20123142997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123142997 is an equidigital number, since it uses as much as digits as its factorization.

20123142997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 20123142997 in words is "twenty billion, one hundred twenty-three million, one hundred forty-two thousand, nine hundred ninety-seven".