1100203120 has 20 divisors (see below), whose sum is σ = 2557972440. Its totient is φ = 440081216.

The previous prime is 1100203087. The next prime is 1100203123. The reversal of 1100203120 is 213020011.

It is a tau number, because it is divible by the number of its divisors (20).

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

It is a junction number, because it is equal to n+sod(n) for n = 1100203097 and 1100203106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100203123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6876190 + ... + 6876349.

It is an arithmetic number, because the mean of its divisors is an integer number (127898622).

Almost surely, 2^1100203120 is an apocalyptic number.

1100203120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1100203120 is an abundant number, since it is smaller than the sum of its proper divisors (1457769320).

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

1100203120 is a wasteful number, since it uses less digits than its factorization.

1100203120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13752552 (or 13752546 counting only the distinct ones).

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

The square root of 1100203120 is about 33169.3099114226. The cubic root of 1100203120 is about 1032.3436499511.

Adding to 1100203120 its reverse (213020011), we get a palindrome (1313223131).

The spelling of 1100203120 in words is "one billion, one hundred million, two hundred three thousand, one hundred twenty".