20634136 has 16 divisors (see below), whose sum is σ = 39045600. Its totient is φ = 10221984.

The previous prime is 20634101. The next prime is 20634143. The reversal of 20634136 is 63143602.

It is a self number, because there is not a number n which added to its sum of digits gives 20634136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10960 + ... + 12703.

It is an arithmetic number, because the mean of its divisors is an integer number (2440350).

Almost surely, 2^20634136 is an apocalyptic number.

It is an amenable number.

20634136 is a deficient number, since it is larger than the sum of its proper divisors (18411464).

20634136 is a wasteful number, since it uses less digits than its factorization.

20634136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23778 (or 23774 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20634136 is about 4542.4812602806. The cubic root of 20634136 is about 274.2808139212.

Adding to 20634136 its reverse (63143602), we get a palindrome (83777738).

The spelling of 20634136 in words is "twenty million, six hundred thirty-four thousand, one hundred thirty-six".