20117385 has 12 divisors (see below), whose sum is σ = 34870212. Its totient is φ = 10729248.

The previous prime is 20117359. The next prime is 20117401. The reversal of 20117385 is 58371102.

It can be written as a sum of positive squares in 2 ways, for example, as 4149369 + 15968016 = 2037^2 + 3996^2 .

It is not a de Polignac number, because 20117385 - 2¹⁴ = 20101001 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223482 + ... + 223571.

It is an arithmetic number, because the mean of its divisors is an integer number (2905851).

Almost surely, 2^20117385 is an apocalyptic number.

It is an amenable number.

20117385 is a deficient number, since it is larger than the sum of its proper divisors (14752827).

20117385 is a wasteful number, since it uses less digits than its factorization.

20117385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447064 (or 447061 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 20117385 is about 4485.2407962115. The cubic root of 20117385 is about 271.9717792593.

Adding to 20117385 its reverse (58371102), we get a palindrome (78488487).

It can be divided in two parts, 20117 and 385, that added together give a palindrome (20502).

The spelling of 20117385 in words is "twenty million, one hundred seventeen thousand, three hundred eighty-five".