20655699 has 4 divisors (see below), whose sum is σ = 27540936. Its totient is φ = 13770464.

The previous prime is 20655689. The next prime is 20655707. The reversal of 20655699 is 99655602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20655699 - 2¹¹ = 20653651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20655699.

It is not an unprimeable number, because it can be changed into a prime (20655619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3442614 + ... + 3442619.

It is an arithmetic number, because the mean of its divisors is an integer number (6885234).

Almost surely, 2^20655699 is an apocalyptic number.

20655699 is a deficient number, since it is larger than the sum of its proper divisors (6885237).

20655699 is an equidigital number, since it uses as much as digits as its factorization.

20655699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6885236.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 20655699 is about 4544.8541230715. The cubic root of 20655699 is about 274.3763232623.

The spelling of 20655699 in words is "twenty million, six hundred fifty-five thousand, six hundred ninety-nine".