20636117 has 4 divisors (see below), whose sum is σ = 20974476. Its totient is φ = 20297760.

The previous prime is 20636093. The next prime is 20636123. The reversal of 20636117 is 71163602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71163602 = 2 ⋅35581801.

It can be written as a sum of positive squares in 2 ways, for example, as 1196836 + 19439281 = 1094^2 + 4409^2 .

It is a cyclic number.

It is not a de Polignac number, because 20636117 - 2¹⁶ = 20570581 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 (20636137) 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, 169088 + ... + 169209.

It is an arithmetic number, because the mean of its divisors is an integer number (5243619).

Almost surely, 2^20636117 is an apocalyptic number.

It is an amenable number.

20636117 is a deficient number, since it is larger than the sum of its proper divisors (338359).

20636117 is an equidigital number, since it uses as much as digits as its factorization.

20636117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338358.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20636117 is about 4542.6993076804. The cubic root of 20636117 is about 274.2895911711.

Adding to 20636117 its reverse (71163602), we get a palindrome (91799719).

The spelling of 20636117 in words is "twenty million, six hundred thirty-six thousand, one hundred seventeen".