25320820 has 48 divisors (see below), whose sum is σ = 64350720. Its totient is φ = 8169984.

The previous prime is 25320797. The next prime is 25320829. The reversal of 25320820 is 2802352.

25320820 = 401² + 402² + ... + 519².

It is a super-2 number, since 2×25320820² = 1282287850944800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25320791 and 25320800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25320829) 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, 2940 + ... + 7699.

It is an arithmetic number, because the mean of its divisors is an integer number (1340640).

Almost surely, 2^25320820 is an apocalyptic number.

25320820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25320820 is an abundant number, since it is smaller than the sum of its proper divisors (39029900).

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

25320820 is a wasteful number, since it uses less digits than its factorization.

25320820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10672 (or 10670 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 25320820 is about 5031.9797296889. The cubic root of 25320820 is about 293.6472391427.

The spelling of 25320820 in words is "twenty-five million, three hundred twenty thousand, eight hundred twenty".