11531020 has 12 divisors (see below), whose sum is σ = 24215184. Its totient is φ = 4612400.

The previous prime is 11531017. The next prime is 11531021. The reversal of 11531020 is 2013511.

It is not an unprimeable number, because it can be changed into a prime (11531021) 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, 288256 + ... + 288295.

It is an arithmetic number, because the mean of its divisors is an integer number (2017932).

Almost surely, 2^11531020 is an apocalyptic number.

11531020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11531020 is an abundant number, since it is smaller than the sum of its proper divisors (12684164).

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

11531020 is a wasteful number, since it uses less digits than its factorization.

11531020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576560 (or 576558 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 11531020 is about 3395.7355609647. The cubic root of 11531020 is about 225.9206393765.

Adding to 11531020 its reverse (2013511), we get a palindrome (13544531).

The spelling of 11531020 in words is "eleven million, five hundred thirty-one thousand, twenty".