13261220 has 24 divisors (see below), whose sum is σ = 31827264. Its totient is φ = 4546656.

The previous prime is 13261219. The next prime is 13261231. The reversal of 13261220 is 2216231.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47222 + ... + 47501.

It is an arithmetic number, because the mean of its divisors is an integer number (1326136).

Almost surely, 2^13261220 is an apocalyptic number.

13261220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13261220 is an abundant number, since it is smaller than the sum of its proper divisors (18566044).

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

13261220 is a wasteful number, since it uses less digits than its factorization.

13261220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94739 (or 94737 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 13261220 is about 3641.5958040398. The cubic root of 13261220 is about 236.6979482115.

Adding to 13261220 its reverse (2216231), we get a palindrome (15477451).

The spelling of 13261220 in words is "thirteen million, two hundred sixty-one thousand, two hundred twenty".