20112997 has 2 divisors, whose sum is σ = 20112998. Its totient is φ = 20112996.

The previous prime is 20112973. The next prime is 20113013. The reversal of 20112997 is 79921102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14130081 + 5982916 = 3759^2 + 2446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20112997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20112907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056498 + 10056499.

It is an arithmetic number, because the mean of its divisors is an integer number (10056499).

Almost surely, 2^20112997 is an apocalyptic number.

It is an amenable number.

20112997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112997 is an equidigital number, since it uses as much as digits as its factorization.

20112997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 20112997 is about 4484.7516096212. The cubic root of 20112997 is about 271.9520036780.

The spelling of 20112997 in words is "twenty million, one hundred twelve thousand, nine hundred ninety-seven".