20418199 has 2 divisors, whose sum is σ = 20418200. Its totient is φ = 20418198.

The previous prime is 20418193. The next prime is 20418239. The reversal of 20418199 is 99181402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20418199 - 2¹³ = 20410007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20418193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10209099 + 10209100.

It is an arithmetic number, because the mean of its divisors is an integer number (10209100).

Almost surely, 2^20418199 is an apocalyptic number.

20418199 is a deficient number, since it is larger than the sum of its proper divisors (1).

20418199 is an equidigital number, since it uses as much as digits as its factorization.

20418199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 20418199 is about 4518.6501302933. The cubic root of 20418199 is about 273.3206704756.

The spelling of 20418199 in words is "twenty million, four hundred eighteen thousand, one hundred ninety-nine".