11387531020 has 12 divisors (see below), whose sum is σ = 23913815184. Its totient is φ = 4555012400.

The previous prime is 11387531009. The next prime is 11387531021. The reversal of 11387531020 is 2013578311.

It is not an unprimeable number, because it can be changed into a prime (11387531021) 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, 284688256 + ... + 284688295.

It is an arithmetic number, because the mean of its divisors is an integer number (1992817932).

Almost surely, 2^11387531020 is an apocalyptic number.

11387531020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11387531020 is an abundant number, since it is smaller than the sum of its proper divisors (12526284164).

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

11387531020 is a wasteful number, since it uses less digits than its factorization.

11387531020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569376560 (or 569376558 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 11387531020 in words is "eleven billion, three hundred eighty-seven million, five hundred thirty-one thousand, twenty".