20418385 has 8 divisors (see below), whose sum is σ = 26386920. Its totient is φ = 15078144.

The previous prime is 20418379. The next prime is 20418401. The reversal of 20418385 is 58381402.

It can be written as a sum of positive squares in 4 ways, for example, as 4322241 + 16096144 = 2079^2 + 4012^2 .

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 20418385 - 2⁵ = 20418353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157000 + ... + 157129.

It is an arithmetic number, because the mean of its divisors is an integer number (3298365).

Almost surely, 2^20418385 is an apocalyptic number.

It is an amenable number.

20418385 is a deficient number, since it is larger than the sum of its proper divisors (5968535).

20418385 is a wasteful number, since it uses less digits than its factorization.

20418385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314147.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20418385 is about 4518.6707116142. The cubic root of 20418385 is about 273.3215004131.

Adding to 20418385 its reverse (58381402), we get a palindrome (78799787).

The spelling of 20418385 in words is "twenty million, four hundred eighteen thousand, three hundred eighty-five".