11771444220 has 48 divisors (see below), whose sum is σ = 33661329408. Its totient is φ = 3072262720.

The previous prime is 11771444203. The next prime is 11771444263. The reversal of 11771444220 is 2244417711.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2084316 + ... + 2089955.

It is an arithmetic number, because the mean of its divisors is an integer number (701277696).

Almost surely, 2^11771444220 is an apocalyptic number.

11771444220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11771444220 is an abundant number, since it is smaller than the sum of its proper divisors (21889885188).

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

11771444220 is a wasteful number, since it uses less digits than its factorization.

11771444220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4174330 (or 4174328 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The spelling of 11771444220 in words is "eleven billion, seven hundred seventy-one million, four hundred forty-four thousand, two hundred twenty".