20568133 has 4 divisors (see below), whose sum is σ = 20581420. Its totient is φ = 20554848.

The previous prime is 20568131. The next prime is 20568137. The reversal of 20568133 is 33186502.

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 16499844 + 4068289 = 4062^2 + 2017^2 .

It is a cyclic number.

It is not a de Polignac number, because 20568133 - 2¹ = 20568131 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 (20568131) 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, 3960 + ... + 7537.

It is an arithmetic number, because the mean of its divisors is an integer number (5145355).

Almost surely, 2^20568133 is an apocalyptic number.

It is an amenable number.

20568133 is a deficient number, since it is larger than the sum of its proper divisors (13287).

20568133 is a wasteful number, since it uses less digits than its factorization.

20568133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13286.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20568133 is about 4535.2103589580. The cubic root of 20568133 is about 273.9880515862.

The spelling of 20568133 in words is "twenty million, five hundred sixty-eight thousand, one hundred thirty-three".