20123049997 has 2 divisors, whose sum is σ = 20123049998. Its totient is φ = 20123049996.

The previous prime is 20123049949. The next prime is 20123050007. The reversal of 20123049997 is 79994032102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18098589961 + 2024460036 = 134531^2 + 44994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123049997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123049197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061524998 + 10061524999.

It is an arithmetic number, because the mean of its divisors is an integer number (10061524999).

Almost surely, 2^20123049997 is an apocalyptic number.

It is an amenable number.

20123049997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123049997 is an equidigital number, since it uses as much as digits as its factorization.

20123049997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 46.

It can be divided in two parts, 2012 and 3049997, that added together give a square (3052009 = 1747²).

The spelling of 20123049997 in words is "twenty billion, one hundred twenty-three million, forty-nine thousand, nine hundred ninety-seven".