20636161 has 16 divisors (see below), whose sum is σ = 26022528. Its totient is φ = 15926400.

The previous prime is 20636159. The next prime is 20636183. The reversal of 20636161 is 16163602.

It is not a de Polignac number, because 20636161 - 2¹ = 20636159 is a prime.

It is a super-2 number, since 2×20636161² = 851702281635842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20636141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 966 + ... + 6496.

It is an arithmetic number, because the mean of its divisors is an integer number (1626408).

Almost surely, 2^20636161 is an apocalyptic number.

It is an amenable number.

20636161 is a deficient number, since it is larger than the sum of its proper divisors (5386367).

20636161 is a wasteful number, since it uses less digits than its factorization.

20636161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5592.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20636161 is about 4542.7041506134. The cubic root of 20636161 is about 274.2897861163.

Adding to 20636161 its reverse (16163602), we get a palindrome (36799763).

The spelling of 20636161 in words is "twenty million, six hundred thirty-six thousand, one hundred sixty-one".