20716655 has 4 divisors (see below), whose sum is σ = 24859992. Its totient is φ = 16573320.

The previous prime is 20716639. The next prime is 20716673. The reversal of 20716655 is 55661702.

It is a happy number.

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

It is not a de Polignac number, because 20716655 - 2⁴ = 20716639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2071661 + ... + 2071670.

It is an arithmetic number, because the mean of its divisors is an integer number (6214998).

Almost surely, 2^20716655 is an apocalyptic number.

20716655 is a deficient number, since it is larger than the sum of its proper divisors (4143337).

20716655 is an equidigital number, since it uses as much as digits as its factorization.

20716655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4143336.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 20716655 is about 4551.5552287103. Note that the first 3 decimals coincide. The cubic root of 20716655 is about 274.6459576151.

The spelling of 20716655 in words is "twenty million, seven hundred sixteen thousand, six hundred fifty-five".