820731425 has 12 divisors (see below), whose sum is σ = 1061955840. Its totient is φ = 628037520.

The previous prime is 820731421. The next prime is 820731427. The reversal of 820731425 is 524137028.

820731425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 820731425 - 2² = 820731421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 820731391 and 820731400.

It is not an unprimeable number, because it can be changed into a prime (820731421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 713105 + ... + 714254.

It is an arithmetic number, because the mean of its divisors is an integer number (88496320).

Almost surely, 2^820731425 is an apocalyptic number.

It is an amenable number.

820731425 is a deficient number, since it is larger than the sum of its proper divisors (241224415).

820731425 is a wasteful number, since it uses less digits than its factorization.

820731425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427392 (or 1427387 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 820731425 is about 28648.4105143723. The cubic root of 820731425 is about 936.2683749780.

The spelling of 820731425 in words is "eight hundred twenty million, seven hundred thirty-one thousand, four hundred twenty-five".