20655761 has 8 divisors (see below), whose sum is σ = 23663424. Its totient is φ = 17662320.

The previous prime is 20655751. The next prime is 20655763. The reversal of 20655761 is 16755602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20655761 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 7 ways as a sum of consecutive naturals, for example, 230 + ... + 6431.

It is an arithmetic number, because the mean of its divisors is an integer number (2957928).

Almost surely, 2^20655761 is an apocalyptic number.

It is an amenable number.

20655761 is a deficient number, since it is larger than the sum of its proper divisors (3007663).

20655761 is an equidigital number, since it uses as much as digits as its factorization.

20655761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7111.

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

The square root of 20655761 is about 4544.8609439674. The cubic root of 20655761 is about 274.3765977841.

The spelling of 20655761 in words is "twenty million, six hundred fifty-five thousand, seven hundred sixty-one".