820581052 has 12 divisors (see below), whose sum is σ = 1471041936. Its totient is φ = 400283360.

The previous prime is 820580963. The next prime is 820581059. The reversal of 820581052 is 250185028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820581059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2501608 + ... + 2501935.

It is an arithmetic number, because the mean of its divisors is an integer number (122586828).

Almost surely, 2^820581052 is an apocalyptic number.

820581052 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

820581052 is a deficient number, since it is larger than the sum of its proper divisors (650460884).

820581052 is a wasteful number, since it uses less digits than its factorization.

820581052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5003588 (or 5003586 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 820581052 is about 28645.7859379002. The cubic root of 820581052 is about 936.2111909917.

The spelling of 820581052 in words is "eight hundred twenty million, five hundred eighty-one thousand, fifty-two".