25430820 has 24 divisors (see below), whose sum is σ = 71206464. Its totient is φ = 6781536.

The previous prime is 25430813. The next prime is 25430833. The reversal of 25430820 is 2803452.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211864 + ... + 211983.

It is an arithmetic number, because the mean of its divisors is an integer number (2966936).

Almost surely, 2^25430820 is an apocalyptic number.

25430820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25430820 is an abundant number, since it is smaller than the sum of its proper divisors (45775644).

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

25430820 is a wasteful number, since it uses less digits than its factorization.

25430820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423859 (or 423857 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 25430820 is about 5042.8979763624. The cubic root of 25430820 is about 294.0718506421.

The spelling of 25430820 in words is "twenty-five million, four hundred thirty thousand, eight hundred twenty".