13220646 has 8 divisors (see below), whose sum is σ = 26441304. Its totient is φ = 4406880.

The previous prime is 13220639. The next prime is 13220659. The reversal of 13220646 is 64602231.

It is a sphenic number, since it is the product of 3 distinct primes.

13220646 is an admirable number.

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, 1101715 + ... + 1101726.

It is an arithmetic number, because the mean of its divisors is an integer number (3305163).

Almost surely, 2^13220646 is an apocalyptic number.

13220646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

13220646 is a wasteful number, since it uses less digits than its factorization.

13220646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203446.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 13220646 is about 3636.0206270042. The cubic root of 13220646 is about 236.4563014197.

Adding to 13220646 its reverse (64602231), we get a palindrome (77822877).

It can be divided in two parts, 132 and 20646, that multiplied together give a palindrome (2725272).

The spelling of 13220646 in words is "thirteen million, two hundred twenty thousand, six hundred forty-six".