13123503220 has 12 divisors (see below), whose sum is σ = 27559356804. Its totient is φ = 5249401280.

The previous prime is 13123503193. The next prime is 13123503227. The reversal of 13123503220 is 2230532131.

It can be written as a sum of positive squares in 2 ways, for example, as 1475481744 + 11648021476 = 38412^2 + 107926^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13123503191 and 13123503200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13123503227) 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, 328087561 + ... + 328087600.

It is an arithmetic number, because the mean of its divisors is an integer number (2296613067).

Almost surely, 2^13123503220 is an apocalyptic number.

13123503220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13123503220 is an abundant number, since it is smaller than the sum of its proper divisors (14435853584).

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

13123503220 is a wasteful number, since it uses less digits than its factorization.

13123503220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656175170 (or 656175168 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The spelling of 13123503220 in words is "thirteen billion, one hundred twenty-three million, five hundred three thousand, two hundred twenty".