1555055020 has 12 divisors (see below), whose sum is σ = 3265615584. Its totient is φ = 622022000.

The previous prime is 1555055003. The next prime is 1555055027. The reversal of 1555055020 is 205505551.

It is a happy number.

It is a super-2 number, since 2×1555055020² = 4836392230454400800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1555055020.

It is not an unprimeable number, because it can be changed into a prime (1555055027) by changing a digit.

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, 38876356 + ... + 38876395.

It is an arithmetic number, because the mean of its divisors is an integer number (272134632).

Almost surely, 2^1555055020 is an apocalyptic number.

1555055020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555055020 is an abundant number, since it is smaller than the sum of its proper divisors (1710560564).

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

1555055020 is a wasteful number, since it uses less digits than its factorization.

1555055020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77752760 (or 77752758 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 1555055020 is about 39434.1859304842. The cubic root of 1555055020 is about 1158.5512581829.

The spelling of 1555055020 in words is "one billion, five hundred fifty-five million, fifty-five thousand, twenty".