1131200020 has 48 divisors (see below), whose sum is σ = 2400205248. Its totient is φ = 447805440.

The previous prime is 1131200003. The next prime is 1131200033. The reversal of 1131200020 is 200021311.

It is a super-2 number, since 2×1131200020² = 2559226970496000800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 875575 + ... + 876865.

It is an arithmetic number, because the mean of its divisors is an integer number (50004276).

Almost surely, 2^1131200020 is an apocalyptic number.

1131200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131200020 is an abundant number, since it is smaller than the sum of its proper divisors (1269005228).

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

1131200020 is a wasteful number, since it uses less digits than its factorization.

1131200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720 (or 1718 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1131200020 is about 33633.3171126489. The cubic root of 1131200020 is about 1041.9490140503.

Adding to 1131200020 its reverse (200021311), we get a palindrome (1331221331).

The spelling of 1131200020 in words is "one billion, one hundred thirty-one million, two hundred thousand, twenty".