20418159 has 4 divisors (see below), whose sum is σ = 27224216. Its totient is φ = 13612104.

The previous prime is 20418157. The next prime is 20418161. The reversal of 20418159 is 95181402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20418157) and next prime (20418161).

It is not a de Polignac number, because 20418159 - 2¹ = 20418157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20418157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3403024 + ... + 3403029.

It is an arithmetic number, because the mean of its divisors is an integer number (6806054).

Almost surely, 2^20418159 is an apocalyptic number.

20418159 is a deficient number, since it is larger than the sum of its proper divisors (6806057).

20418159 is an equidigital number, since it uses as much as digits as its factorization.

20418159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6806056.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 20418159 is about 4518.6457041906. The cubic root of 20418159 is about 273.3204919937.

The spelling of 20418159 in words is "twenty million, four hundred eighteen thousand, one hundred fifty-nine".