11381820 has 24 divisors (see below), whose sum is σ = 31869264. Its totient is φ = 3035136.

The previous prime is 11381813. The next prime is 11381827. The reversal of 11381820 is 2818311.

It is an interprime number because it is at equal distance from previous prime (11381813) and next prime (11381827).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11381827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94789 + ... + 94908.

It is an arithmetic number, because the mean of its divisors is an integer number (1327886).

Almost surely, 2^11381820 is an apocalyptic number.

11381820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11381820 is an abundant number, since it is smaller than the sum of its proper divisors (20487444).

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

11381820 is a wasteful number, since it uses less digits than its factorization.

11381820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189709 (or 189707 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 11381820 is about 3373.6953033728. The cubic root of 11381820 is about 224.9420097466.

The spelling of 11381820 in words is "eleven million, three hundred eighty-one thousand, eight hundred twenty".