20634849 has 12 divisors (see below), whose sum is σ = 30533412. Its totient is φ = 13420800.

The previous prime is 20634799. The next prime is 20634851. The reversal of 20634849 is 94843602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11289600 + 9345249 = 3360^2 + 3057^2 .

It is not a de Polignac number, because 20634849 - 2¹³ = 20626657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20634349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27592 + ... + 28329.

It is an arithmetic number, because the mean of its divisors is an integer number (2544451).

Almost surely, 2^20634849 is an apocalyptic number.

It is an amenable number.

20634849 is a deficient number, since it is larger than the sum of its proper divisors (9898563).

20634849 is a wasteful number, since it uses less digits than its factorization.

20634849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55968 (or 55965 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 20634849 is about 4542.5597409390. The cubic root of 20634849 is about 274.2839730870.

The spelling of 20634849 in words is "twenty million, six hundred thirty-four thousand, eight hundred forty-nine".