1200055020 has 24 divisors (see below), whose sum is σ = 3360154224. Its totient is φ = 320014656.

The previous prime is 1200055009. The next prime is 1200055079. The reversal of 1200055020 is 205500021.

1200055020 is digitally balanced in base 4, 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 (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10000399 + ... + 10000518.

It is an arithmetic number, because the mean of its divisors is an integer number (140006426).

Almost surely, 2^1200055020 is an apocalyptic number.

1200055020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200055020 is an abundant number, since it is smaller than the sum of its proper divisors (2160099204).

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

1200055020 is a wasteful number, since it uses less digits than its factorization.

1200055020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20000929 (or 20000927 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 1200055020 is about 34641.8102875701. The cubic root of 1200055020 is about 1062.6748098995.

Adding to 1200055020 its reverse (205500021), we get a palindrome (1405555041).

The spelling of 1200055020 in words is "one billion, two hundred million, fifty-five thousand, twenty".