1200115020 has 48 divisors (see below), whose sum is σ = 3618810720. Its totient is φ = 295412736.

The previous prime is 1200115003. The next prime is 1200115073. The reversal of 1200115020 is 205110021.

It is a super-2 number, since 2×1200115020² = 2880552122459200800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1200114987 and 1200115005.

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 15 ways as a sum of consecutive naturals, for example, 768525 + ... + 770084.

It is an arithmetic number, because the mean of its divisors is an integer number (75391890).

Almost surely, 2^1200115020 is an apocalyptic number.

1200115020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200115020 is an abundant number, since it is smaller than the sum of its proper divisors (2418695700).

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

1200115020 is a wasteful number, since it uses less digits than its factorization.

1200115020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538634 (or 1538632 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 1200115020 is about 34642.6762822967. The cubic root of 1200115020 is about 1062.6925200392.

Adding to 1200115020 its reverse (205110021), we get a palindrome (1405225041).

The spelling of 1200115020 in words is "one billion, two hundred million, one hundred fifteen thousand, twenty".