11531454220 has 48 divisors (see below), whose sum is σ = 28449636768. Its totient is φ = 3870696960.

The previous prime is 11531454197. The next prime is 11531454223. The reversal of 11531454220 is 2245413511.

It is not an unprimeable number, because it can be changed into a prime (11531454223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2013129 + ... + 2018848.

It is an arithmetic number, because the mean of its divisors is an integer number (592700766).

Almost surely, 2^11531454220 is an apocalyptic number.

11531454220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11531454220 is an abundant number, since it is smaller than the sum of its proper divisors (16918182548).

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

11531454220 is a wasteful number, since it uses less digits than its factorization.

11531454220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032010 (or 4032008 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 11531454220 its reverse (2245413511), we get a palindrome (13776867731).

The spelling of 11531454220 in words is "eleven billion, five hundred thirty-one million, four hundred fifty-four thousand, two hundred twenty".