13220685 has 16 divisors (see below), whose sum is σ = 23503680. Its totient is φ = 7050960.

The previous prime is 13220671. The next prime is 13220687. The reversal of 13220685 is 58602231.

It is not a de Polignac number, because 13220685 - 2¹⁵ = 13187917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48831 + ... + 49100.

It is an arithmetic number, because the mean of its divisors is an integer number (1468980).

Almost surely, 2^13220685 is an apocalyptic number.

13220685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13220685 is a deficient number, since it is larger than the sum of its proper divisors (10282995).

13220685 is an equidigital number, since it uses as much as digits as its factorization.

13220685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97945 (or 97939 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 13220685 is about 3636.0259900061. The cubic root of 13220685 is about 236.4565339294.

The spelling of 13220685 in words is "thirteen million, two hundred twenty thousand, six hundred eighty-five".