13551220 has 12 divisors (see below), whose sum is σ = 28457604. Its totient is φ = 5420480.

The previous prime is 13551217. The next prime is 13551233. The reversal of 13551220 is 2215531.

It can be written as a sum of positive squares in 2 ways, for example, as 6780816 + 6770404 = 2604^2 + 2602^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338761 + ... + 338800.

It is an arithmetic number, because the mean of its divisors is an integer number (2371467).

Almost surely, 2^13551220 is an apocalyptic number.

13551220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13551220 is an abundant number, since it is smaller than the sum of its proper divisors (14906384).

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

13551220 is a wasteful number, since it uses less digits than its factorization.

13551220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677570 (or 677568 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 13551220 is about 3681.1981745079. The cubic root of 13551220 is about 238.4109136109.

Adding to 13551220 its reverse (2215531), we get a palindrome (15766751).

The spelling of 13551220 in words is "thirteen million, five hundred fifty-one thousand, two hundred twenty".