20644124 has 6 divisors (see below), whose sum is σ = 36127224. Its totient is φ = 10322060.

The previous prime is 20644123. The next prime is 20644153. The reversal of 20644124 is 42144602.

It is a self number, because there is not a number n which added to its sum of digits gives 20644124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20644123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2580512 + ... + 2580519.

It is an arithmetic number, because the mean of its divisors is an integer number (6021204).

Almost surely, 2^20644124 is an apocalyptic number.

It is an amenable number.

20644124 is a deficient number, since it is larger than the sum of its proper divisors (15483100).

20644124 is a wasteful number, since it uses less digits than its factorization.

20644124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5161035 (or 5161033 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 20644124 is about 4543.5805264131. The cubic root of 20644124 is about 274.3250621977.

Adding to 20644124 its reverse (42144602), we get a palindrome (62788726).

The spelling of 20644124 in words is "twenty million, six hundred forty-four thousand, one hundred twenty-four".