25009920 has 216 divisors, whose sum is σ = 93746016. Its totient is φ = 6119424.

The previous prime is 25009913. The next prime is 25009921. The reversal of 25009920 is 2990052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25009921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149677 + ... + 149843.

Almost surely, 2^25009920 is an apocalyptic number.

25009920 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 25009920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46873008).

25009920 is an abundant number, since it is smaller than the sum of its proper divisors (68736096).

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

25009920 is a wasteful number, since it uses less digits than its factorization.

25009920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 25009920 is about 5000.9919016131. The cubic root of 25009920 is about 292.4404437150.

Adding to 25009920 its reverse (2990052), we get a palindrome (27999972).

The spelling of 25009920 in words is "twenty-five million, nine thousand, nine hundred twenty".