20566055 has 4 divisors (see below), whose sum is σ = 24679272. Its totient is φ = 16452840.

The previous prime is 20566019. The next prime is 20566057. The reversal of 20566055 is 55066502.

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

It is not a de Polignac number, because 20566055 - 2⁸ = 20565799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566057) 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, 2056601 + ... + 2056610.

It is an arithmetic number, because the mean of its divisors is an integer number (6169818).

Almost surely, 2^20566055 is an apocalyptic number.

20566055 is a deficient number, since it is larger than the sum of its proper divisors (4113217).

20566055 is an equidigital number, since it uses as much as digits as its factorization.

20566055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113216.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 20566055 is about 4534.9812568521. The cubic root of 20566055 is about 273.9788242644.

The spelling of 20566055 in words is "twenty million, five hundred sixty-six thousand, fifty-five".