20135566 has 8 divisors (see below), whose sum is σ = 32949144. Its totient is φ = 9152520.

The previous prime is 20135539. The next prime is 20135587. The reversal of 20135566 is 66553102.

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

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, 457605 + ... + 457648.

It is an arithmetic number, because the mean of its divisors is an integer number (4118643).

Almost surely, 2^20135566 is an apocalyptic number.

20135566 is a deficient number, since it is larger than the sum of its proper divisors (12813578).

20135566 is a wasteful number, since it uses less digits than its factorization.

20135566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915266.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 20135566 is about 4487.2670970202. The cubic root of 20135566 is about 272.0536856978.

Adding to 20135566 its reverse (66553102), we get a palindrome (86688668).

The spelling of 20135566 in words is "twenty million, one hundred thirty-five thousand, five hundred sixty-six".