820371560 has 16 divisors (see below), whose sum is σ = 1845836100. Its totient is φ = 328148608.

The previous prime is 820371557. The next prime is 820371571. The reversal of 820371560 is 65173028.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 820364164 + 7396 = 28642^2 + 86^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10254605 + ... + 10254684.

Almost surely, 2^820371560 is an apocalyptic number.

It is an amenable number.

820371560 is an abundant number, since it is smaller than the sum of its proper divisors (1025464540).

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

820371560 is a wasteful number, since it uses less digits than its factorization.

820371560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20509300 (or 20509296 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 820371560 is about 28642.1291108046. The cubic root of 820371560 is about 936.1315135294.

The spelling of 820371560 in words is "eight hundred twenty million, three hundred seventy-one thousand, five hundred sixty".