20655713 has 4 divisors (see below), whose sum is σ = 22244628. Its totient is φ = 19066800.

The previous prime is 20655707. The next prime is 20655737. The reversal of 20655713 is 31755602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11607649 + 9048064 = 3407^2 + 3008^2 .

It is a cyclic number.

It is not a de Polignac number, because 20655713 - 2⁸ = 20655457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20655763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794438 + ... + 794463.

It is an arithmetic number, because the mean of its divisors is an integer number (5561157).

Almost surely, 2^20655713 is an apocalyptic number.

It is an amenable number.

20655713 is a deficient number, since it is larger than the sum of its proper divisors (1588915).

20655713 is a wasteful number, since it uses less digits than its factorization.

20655713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588914.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 20655713 is about 4544.8556632747. The cubic root of 20655713 is about 274.3763852511.

The spelling of 20655713 in words is "twenty million, six hundred fifty-five thousand, seven hundred thirteen".