25244213820 has 192 divisors, whose sum is σ = 82866094080. Its totient is φ = 5621882112.

The previous prime is 25244213791. The next prime is 25244213821. The reversal of 25244213820 is 2831244252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25244213821) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8360271 + ... + 8363289.

It is an arithmetic number, because the mean of its divisors is an integer number (431594240).

Almost surely, 2^25244213820 is an apocalyptic number.

25244213820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25244213820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41433047040).

25244213820 is an abundant number, since it is smaller than the sum of its proper divisors (57621880260).

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

25244213820 is a wasteful number, since it uses less digits than its factorization.

25244213820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3544 (or 3542 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The spelling of 25244213820 in words is "twenty-five billion, two hundred forty-four million, two hundred thirteen thousand, eight hundred twenty".