25801920 has 252 divisors, whose sum is σ = 97316544. Its totient is φ = 6266880.

The previous prime is 25801907. The next prime is 25801921. The reversal of 25801920 is 2910852.

It is not an unprimeable number, because it can be changed into a prime (25801921) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 832305 + ... + 832335.

Almost surely, 2^25801920 is an apocalyptic number.

25801920 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 25801920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48658272).

25801920 is an abundant number, since it is smaller than the sum of its proper divisors (71514624).

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

25801920 is a wasteful number, since it uses less digits than its factorization.

25801920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 25801920 is about 5079.5590359794. The cubic root of 25801920 is about 295.4953661225.

The spelling of 25801920 in words is "twenty-five million, eight hundred one thousand, nine hundred twenty".