11100820 has 12 divisors (see below), whose sum is σ = 23311764. Its totient is φ = 4440320.

The previous prime is 11100787. The next prime is 11100827. The reversal of 11100820 is 2800111.

It can be written as a sum of positive squares in 2 ways, for example, as 8832784 + 2268036 = 2972^2 + 1506^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 11100820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100827) 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, 277501 + ... + 277540.

It is an arithmetic number, because the mean of its divisors is an integer number (1942647).

Almost surely, 2^11100820 is an apocalyptic number.

11100820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11100820 is an abundant number, since it is smaller than the sum of its proper divisors (12210944).

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

11100820 is a wasteful number, since it uses less digits than its factorization.

11100820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555050 (or 555048 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 11100820 is about 3331.7893090650. The cubic root of 11100820 is about 223.0754033251.

Adding to 11100820 its reverse (2800111), we get a palindrome (13900931).

The spelling of 11100820 in words is "eleven million, one hundred thousand, eight hundred twenty".