25573820 has 48 divisors (see below), whose sum is σ = 55617408. Its totient is φ = 9871680.

The previous prime is 25573819. The next prime is 25573837. The reversal of 25573820 is 2837552.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 112547 + ... + 112773.

It is an arithmetic number, because the mean of its divisors is an integer number (1158696).

Almost surely, 2^25573820 is an apocalyptic number.

25573820 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 25573820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27808704).

25573820 is an abundant number, since it is smaller than the sum of its proper divisors (30043588).

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

25573820 is a wasteful number, since it uses less digits than its factorization.

25573820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 25573820 is about 5057.0564560819. The cubic root of 25573820 is about 294.6220190152.

The spelling of 25573820 in words is "twenty-five million, five hundred seventy-three thousand, eight hundred twenty".