20142197 has 2 divisors, whose sum is σ = 20142198. Its totient is φ = 20142196.

The previous prime is 20142169. The next prime is 20142209. The reversal of 20142197 is 79124102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17859076 + 2283121 = 4226^2 + 1511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20142197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20142797) 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, 10071098 + 10071099.

It is an arithmetic number, because the mean of its divisors is an integer number (10071099).

Almost surely, 2^20142197 is an apocalyptic number.

It is an amenable number.

20142197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20142197 is an equidigital number, since it uses as much as digits as its factorization.

20142197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20142197 is about 4488.0059046307. The cubic root of 20142197 is about 272.0835464593.

Adding to 20142197 its reverse (79124102), we get a palindrome (99266299).

The spelling of 20142197 in words is "twenty million, one hundred forty-two thousand, one hundred ninety-seven".