1020055556 has 72 divisors (see below), whose sum is σ = 2065103040. Its totient is φ = 438133248.

The previous prime is 1020055549. The next prime is 1020055577. The reversal of 1020055556 is 6555500201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1547555 + ... + 1548213.

Almost surely, 2^1020055556 is an apocalyptic number.

It is an amenable number.

1020055556 is an abundant number, since it is smaller than the sum of its proper divisors (1045047484).

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

1020055556 is a wasteful number, since it uses less digits than its factorization.

1020055556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 1020055556 is about 31938.3085964176. The cubic root of 1020055556 is about 1006.6409850228.

Adding to 1020055556 its reverse (6555500201), we get a palindrome (7575555757).

It can be divided in two parts, 10200 and 55556, that added together give a palindrome (65756).

The spelling of 1020055556 in words is "one billion, twenty million, fifty-five thousand, five hundred fifty-six".