25247820 has 48 divisors (see below), whose sum is σ = 76134240. Its totient is φ = 6214656.

The previous prime is 25247819. The next prime is 25247851. The reversal of 25247820 is 2874252.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15405 + ... + 16964.

It is an arithmetic number, because the mean of its divisors is an integer number (1586130).

Almost surely, 2^25247820 is an apocalyptic number.

25247820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25247820 is an abundant number, since it is smaller than the sum of its proper divisors (50886420).

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

25247820 is a wasteful number, since it uses less digits than its factorization.

25247820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32394 (or 32392 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 25247820 is about 5024.7208877708. The cubic root of 25247820 is about 293.3647722272.

The spelling of 25247820 in words is "twenty-five million, two hundred forty-seven thousand, eight hundred twenty".