25220244 has 48 divisors (see below), whose sum is σ = 67874688. Its totient is φ = 7139328.

The previous prime is 25220191. The next prime is 25220257. The reversal of 25220244 is 44202252.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 25220244.

It is a congruent 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, 8164 + ... + 10820.

It is an arithmetic number, because the mean of its divisors is an integer number (1414056).

Almost surely, 2^25220244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25220244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33937344).

25220244 is an abundant number, since it is smaller than the sum of its proper divisors (42654444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25220244 is a wasteful number, since it uses less digits than its factorization.

25220244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2784 (or 2782 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 25220244 is about 5021.9761050805. The cubic root of 25220244 is about 293.2579277020.

Adding to 25220244 its reverse (44202252), we get a palindrome (69422496).

The spelling of 25220244 in words is "twenty-five million, two hundred twenty thousand, two hundred forty-four".