13620069 has 20 divisors (see below), whose sum is σ = 20480460. Its totient is φ = 9020160.

The previous prime is 13620059. The next prime is 13620073. The reversal of 13620069 is 96002631.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 202500 + 13417569 = 450^2 + 3663^2 .

It is not a de Polignac number, because 13620069 - 2⁵ = 13620037 is a prime.

It is a super-2 number, since 2×13620069² = 371012559129522, which contains 22 as substring.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13620059) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14197 + ... + 15125.

It is an arithmetic number, because the mean of its divisors is an integer number (1024023).

Almost surely, 2^13620069 is an apocalyptic number.

It is an amenable number.

13620069 is a deficient number, since it is larger than the sum of its proper divisors (6860391).

13620069 is an equidigital number, since it uses as much as digits as its factorization.

13620069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122 (or 1113 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 13620069 is about 3690.5377656921. The cubic root of 13620069 is about 238.8139925136.

The spelling of 13620069 in words is "thirteen million, six hundred twenty thousand, sixty-nine".