13620555 has 60 divisors (see below), whose sum is σ = 26571600. Its totient is φ = 6671808.

The previous prime is 13620533. The next prime is 13620571. The reversal of 13620555 is 55502631.

13620555 = T₂₆₆ + T₂₆₇ + ... + T₄₆₄.

It is not a de Polignac number, because 13620555 - 2¹⁹ = 13096267 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 an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 68346 + ... + 68544.

It is an arithmetic number, because the mean of its divisors is an integer number (442860).

Almost surely, 2^13620555 is an apocalyptic number.

13620555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13620555 is a deficient number, since it is larger than the sum of its proper divisors (12951045).

13620555 is a wasteful number, since it uses less digits than its factorization.

13620555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 13620555 is about 3690.6036091675. The cubic root of 13620555 is about 238.8168329843.

The spelling of 13620555 in words is "thirteen million, six hundred twenty thousand, five hundred fifty-five".