20892197 has 2 divisors, whose sum is σ = 20892198. Its totient is φ = 20892196.

The previous prime is 20892181. The next prime is 20892217. The reversal of 20892197 is 79129802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18957316 + 1934881 = 4354^2 + 1391^2 .

It is a cyclic number.

It is not a de Polignac number, because 20892197 - 2⁴ = 20892181 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20892197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20892397) 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, 10446098 + 10446099.

It is an arithmetic number, because the mean of its divisors is an integer number (10446099).

Almost surely, 2^20892197 is an apocalyptic number.

It is an amenable number.

20892197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20892197 is an equidigital number, since it uses as much as digits as its factorization.

20892197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 20892197 is about 4570.7982891394. The cubic root of 20892197 is about 275.4195117766.

The spelling of 20892197 in words is "twenty million, eight hundred ninety-two thousand, one hundred ninety-seven".