11203031220 has 24 divisors (see below), whose sum is σ = 31368487584. Its totient is φ = 2987474976.

The previous prime is 11203031167. The next prime is 11203031243. The reversal of 11203031220 is 2213030211.

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 11203031220.

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, 93358534 + ... + 93358653.

It is an arithmetic number, because the mean of its divisors is an integer number (1307020316).

Almost surely, 2^11203031220 is an apocalyptic number.

11203031220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11203031220 is an abundant number, since it is smaller than the sum of its proper divisors (20165456364).

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

11203031220 is a wasteful number, since it uses less digits than its factorization.

11203031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186717199 (or 186717197 counting only the distinct ones).

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

Adding to 11203031220 its reverse (2213030211), we get a palindrome (13416061431).

The spelling of 11203031220 in words is "eleven billion, two hundred three million, thirty-one thousand, two hundred twenty".