11523220420 has 12 divisors (see below), whose sum is σ = 24198762924. Its totient is φ = 4609288160.

The previous prime is 11523220417. The next prime is 11523220421. The reversal of 11523220420 is 2402232511.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8891735616 + 2631484804 = 94296^2 + 51298^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11523220391 and 11523220400.

It is not an unprimeable number, because it can be changed into a prime (11523220421) 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, 288080491 + ... + 288080530.

It is an arithmetic number, because the mean of its divisors is an integer number (2016563577).

Almost surely, 2^11523220420 is an apocalyptic number.

11523220420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11523220420 is an abundant number, since it is smaller than the sum of its proper divisors (12675542504).

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

11523220420 is a wasteful number, since it uses less digits than its factorization.

11523220420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576161030 (or 576161028 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 11523220420 its reverse (2402232511), we get a palindrome (13925452931).

The spelling of 11523220420 in words is "eleven billion, five hundred twenty-three million, two hundred twenty thousand, four hundred twenty".