20198287 has 2 divisors, whose sum is σ = 20198288. Its totient is φ = 20198286.

The previous prime is 20198279. The next prime is 20198327. The reversal of 20198287 is 78289102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20198287 - 2³ = 20198279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20198987) 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, 10099143 + 10099144.

It is an arithmetic number, because the mean of its divisors is an integer number (10099144).

Almost surely, 2^20198287 is an apocalyptic number.

20198287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20198287 is an equidigital number, since it uses as much as digits as its factorization.

20198287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 20198287 is about 4494.2504380597. The cubic root of 20198287 is about 272.3358695146.

The spelling of 20198287 in words is "twenty million, one hundred ninety-eight thousand, two hundred eighty-seven".