25306820 has 48 divisors (see below), whose sum is σ = 66261888. Its totient is φ = 7887360.

The previous prime is 25306807. The next prime is 25306823. The reversal of 25306820 is 2860352.

It is a self number, because there is not a number n which added to its sum of digits gives 25306820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25306823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6677 + ... + 9756.

It is an arithmetic number, because the mean of its divisors is an integer number (1380456).

Almost surely, 2^25306820 is an apocalyptic number.

25306820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25306820 is an abundant number, since it is smaller than the sum of its proper divisors (40955068).

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

25306820 is a wasteful number, since it uses less digits than its factorization.

25306820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16460 (or 16458 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 25306820 is about 5030.5884347659. The cubic root of 25306820 is about 293.5931095206.

The spelling of 25306820 in words is "twenty-five million, three hundred six thousand, eight hundred twenty".