20198837 has 2 divisors, whose sum is σ = 20198838. Its totient is φ = 20198836.

The previous prime is 20198831. The next prime is 20198903. The reversal of 20198837 is 73889102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11383876 + 8814961 = 3374^2 + 2969^2 .

It is a cyclic number.

It is not a de Polignac number, because 20198837 - 2⁴ = 20198821 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 20198837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20198831) 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, 10099418 + 10099419.

It is an arithmetic number, because the mean of its divisors is an integer number (10099419).

Almost surely, 2^20198837 is an apocalyptic number.

It is an amenable number.

20198837 is a deficient number, since it is larger than the sum of its proper divisors (1).

20198837 is an equidigital number, since it uses as much as digits as its factorization.

20198837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 20198837 is about 4494.3116269347. The cubic root of 20198837 is about 272.3383413970.

The spelling of 20198837 in words is "twenty million, one hundred ninety-eight thousand, eight hundred thirty-seven".