1131100020 has 72 divisors (see below), whose sum is σ = 3611593440. Its totient is φ = 285750720.

The previous prime is 1131099997. The next prime is 1131100031. The reversal of 1131100020 is 200011311.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1131099975 and 1131100011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161946 + ... + 168785.

It is an arithmetic number, because the mean of its divisors is an integer number (50161020).

Almost surely, 2^1131100020 is an apocalyptic number.

1131100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131100020 is an abundant number, since it is smaller than the sum of its proper divisors (2480493420).

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

1131100020 is a wasteful number, since it uses less digits than its factorization.

1131100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330765 (or 330760 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1131100020 is about 33631.8304586592. The cubic root of 1131100020 is about 1041.9183097923.

Adding to 1131100020 its reverse (200011311), we get a palindrome (1331111331).

The spelling of 1131100020 in words is "one billion, one hundred thirty-one million, one hundred thousand, twenty".