820081025 has 6 divisors (see below), whose sum is σ = 1016900502. Its totient is φ = 656064800.

The previous prime is 820081019. The next prime is 820081033. The reversal of 820081025 is 520180028.

It can be written as a sum of positive squares in 3 ways, for example, as 52070656 + 768010369 = 7216^2 + 27713^2 .

It is not a de Polignac number, because 820081025 - 2¹⁶ = 820015489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820080985 and 820081003.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16401596 + ... + 16401645.

It is an arithmetic number, because the mean of its divisors is an integer number (169483417).

Almost surely, 2^820081025 is an apocalyptic number.

It is an amenable number.

820081025 is a deficient number, since it is larger than the sum of its proper divisors (196819477).

820081025 is a wasteful number, since it uses less digits than its factorization.

820081025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32803251 (or 32803246 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 820081025 is about 28637.0568494739. The cubic root of 820081025 is about 936.0209899991.

The spelling of 820081025 in words is "eight hundred twenty million, eighty-one thousand, twenty-five".