10323131220 has 72 divisors (see below), whose sum is σ = 31623588360. Its totient is φ = 2725574400.

The previous prime is 10323131173. The next prime is 10323131227. The reversal of 10323131220 is 2213132301.

10323131220 is a `hidden beast` number, since 10 + 323 + 1 + 312 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6439099536 + 3884031684 = 80244^2 + 62322^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 10323131193 and 10323131202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10323131227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265735 + ... + 302094.

It is an arithmetic number, because the mean of its divisors is an integer number (439216505).

Almost surely, 2^10323131220 is an apocalyptic number.

10323131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10323131220 is an abundant number, since it is smaller than the sum of its proper divisors (21300457140).

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

10323131220 is a wasteful number, since it uses less digits than its factorization.

10323131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567945 (or 567940 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 10323131220 its reverse (2213132301), we get a palindrome (12536263521).

The spelling of 10323131220 in words is "ten billion, three hundred twenty-three million, one hundred thirty-one thousand, two hundred twenty".