25671820 has 12 divisors (see below), whose sum is σ = 53910864. Its totient is φ = 10268720.

The previous prime is 25671809. The next prime is 25671847. The reversal of 25671820 is 2817652.

It is a super-2 number, since 2×25671820² = 1318084684224800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641776 + ... + 641815.

It is an arithmetic number, because the mean of its divisors is an integer number (4492572).

Almost surely, 2^25671820 is an apocalyptic number.

25671820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25671820 is an abundant number, since it is smaller than the sum of its proper divisors (28239044).

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

25671820 is a wasteful number, since it uses less digits than its factorization.

25671820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283600 (or 1283598 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 25671820 is about 5066.7366223241. The cubic root of 25671820 is about 294.9978741588.

The spelling of 25671820 in words is "twenty-five million, six hundred seventy-one thousand, eight hundred twenty".