11031971920 has 40 divisors (see below), whose sum is σ = 25821505800. Its totient is φ = 4383168000.

The previous prime is 11031971917. The next prime is 11031971933. The reversal of 11031971920 is 2917913011.

It can be written as a sum of positive squares in 4 ways, for example, as 135117376 + 10896854544 = 11624^2 + 104388^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 450831 + ... + 474670.

It is an arithmetic number, because the mean of its divisors is an integer number (645537645).

Almost surely, 2^11031971920 is an apocalyptic number.

11031971920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11031971920 is an abundant number, since it is smaller than the sum of its proper divisors (14789533880).

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

11031971920 is a wasteful number, since it uses less digits than its factorization.

11031971920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925663 (or 925657 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 34.

The spelling of 11031971920 in words is "eleven billion, thirty-one million, nine hundred seventy-one thousand, nine hundred twenty".