1131320220 has 24 divisors (see below), whose sum is σ = 3167696784. Its totient is φ = 301685376.

The previous prime is 1131320209. The next prime is 1131320269. The reversal of 1131320220 is 220231311.

1131320220 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 a self number, because there is not a number n which added to its sum of digits gives 1131320220.

It is a congruent number.

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, 9427609 + ... + 9427728.

It is an arithmetic number, because the mean of its divisors is an integer number (131987366).

Almost surely, 2^1131320220 is an apocalyptic number.

1131320220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131320220 is an abundant number, since it is smaller than the sum of its proper divisors (2036376564).

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

1131320220 is a wasteful number, since it uses less digits than its factorization.

1131320220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18855349 (or 18855347 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1131320220 is about 33635.1039837846. The cubic root of 1131320220 is about 1041.9859181738.

Adding to 1131320220 its reverse (220231311), we get a palindrome (1351551531).

The spelling of 1131320220 in words is "one billion, one hundred thirty-one million, three hundred twenty thousand, two hundred twenty".