13312220 has 24 divisors (see below), whose sum is σ = 28174608. Its totient is φ = 5283200.

The previous prime is 13312199. The next prime is 13312231. The reversal of 13312220 is 2221331.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 13312195 and 13312204.

It is a congruent number.

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, 80 + ... + 5160.

It is an arithmetic number, because the mean of its divisors is an integer number (1173942).

Almost surely, 2^13312220 is an apocalyptic number.

13312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13312220 is an abundant number, since it is smaller than the sum of its proper divisors (14862388).

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

13312220 is a wasteful number, since it uses less digits than its factorization.

13312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5221 (or 5219 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 13312220 is about 3648.5915090621. The cubic root of 13312220 is about 237.0009910526. Note that the first 3 decimals are identical.

Adding to 13312220 its reverse (2221331), we get a palindrome (15533551).

The spelling of 13312220 in words is "thirteen million, three hundred twelve thousand, two hundred twenty".