20825144 has 8 divisors (see below), whose sum is σ = 39047160. Its totient is φ = 10412568.

The previous prime is 20825099. The next prime is 20825177. The reversal of 20825144 is 44152802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1301564 + ... + 1301579.

It is an arithmetic number, because the mean of its divisors is an integer number (4880895).

Almost surely, 2^20825144 is an apocalyptic number.

It is an amenable number.

20825144 is a deficient number, since it is larger than the sum of its proper divisors (18222016).

20825144 is a wasteful number, since it uses less digits than its factorization.

20825144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2603149 (or 2603145 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 20825144 is about 4563.4574611801. The cubic root of 20825144 is about 275.1245452389.

Adding to 20825144 its reverse (44152802), we get a palindrome (64977946).

It can be divided in two parts, 208 and 25144, that added together give a palindrome (25352).

The spelling of 20825144 in words is "twenty million, eight hundred twenty-five thousand, one hundred forty-four".