20644130 has 32 divisors (see below), whose sum is σ = 40219200. Its totient is φ = 7584192.

The previous prime is 20644123. The next prime is 20644153. The reversal of 20644130 is 3144602.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49061 + ... + 49479.

It is an arithmetic number, because the mean of its divisors is an integer number (1256850).

Almost surely, 2^20644130 is an apocalyptic number.

20644130 is a deficient number, since it is larger than the sum of its proper divisors (19575070).

20644130 is a wasteful number, since it uses less digits than its factorization.

20644130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20644130 is about 4543.5811866852. The cubic root of 20644130 is about 274.3250887743.

Adding to 20644130 its reverse (3144602), we get a palindrome (23788732).

The spelling of 20644130 in words is "twenty million, six hundred forty-four thousand, one hundred thirty".