20418091 has 8 divisors (see below), whose sum is σ = 20922624. Its totient is φ = 19918080.

The previous prime is 20418031. The next prime is 20418121. The reversal of 20418091 is 19081402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20418091 - 2⁷ = 20417963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20418011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9115 + ... + 11131.

It is an arithmetic number, because the mean of its divisors is an integer number (2615328).

Almost surely, 2^20418091 is an apocalyptic number.

20418091 is a deficient number, since it is larger than the sum of its proper divisors (504533).

20418091 is a wasteful number, since it uses less digits than its factorization.

20418091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20418091 is about 4518.6381798059. The cubic root of 20418091 is about 273.3201885740.

Adding to 20418091 its reverse (19081402), we get a palindrome (39499493).

The spelling of 20418091 in words is "twenty million, four hundred eighteen thousand, ninety-one".