20636145 has 24 divisors (see below), whose sum is σ = 35880000. Its totient is φ = 10971936.

The previous prime is 20636141. The next prime is 20636159. The reversal of 20636145 is 54163602.

20636145 is a `hidden beast` number, since 20 + 636 + 1 + 4 + 5 = 666.

It is not a de Polignac number, because 20636145 - 2² = 20636141 is a prime.

It is a super-2 number, since 2×20636145² = 851700960922050, which contains 22 as substring.

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 21996 + ... + 22914.

It is an arithmetic number, because the mean of its divisors is an integer number (1495000).

Almost surely, 2^20636145 is an apocalyptic number.

It is an amenable number.

20636145 is a deficient number, since it is larger than the sum of its proper divisors (15243855).

20636145 is a wasteful number, since it uses less digits than its factorization.

20636145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429 (or 1426 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20636145 is about 4542.7023895474. The cubic root of 20636145 is about 274.2897152272.

Adding to 20636145 its reverse (54163602), we get a palindrome (74799747).

The spelling of 20636145 in words is "twenty million, six hundred thirty-six thousand, one hundred forty-five".