1020800556 has 30 divisors (see below), whose sum is σ = 2668575140. Its totient is φ = 340266744.

The previous prime is 1020800533. The next prime is 1020800569. The reversal of 1020800556 is 6550080201.

1020800556 is a `hidden beast` number, since 10 + 20 + 80 + 0 + 556 = 666.

1020800556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1574986 + ... + 1575633.

Almost surely, 2^1020800556 is an apocalyptic number.

It is an amenable number.

1020800556 is an abundant number, since it is smaller than the sum of its proper divisors (1647774584).

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

1020800556 is a wasteful number, since it uses less digits than its factorization.

1020800556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3150635 (or 3150624 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1020800556 is about 31949.9695774503. The cubic root of 1020800556 is about 1006.8859929306.

Adding to 1020800556 its reverse (6550080201), we get a palindrome (7570880757).

The spelling of 1020800556 in words is "one billion, twenty million, eight hundred thousand, five hundred fifty-six".