20100566 has 4 divisors (see below), whose sum is σ = 30150852. Its totient is φ = 10050282.

The previous prime is 20100559. The next prime is 20100569. The reversal of 20100566 is 66500102.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5025140 + ... + 5025143.

It is an arithmetic number, because the mean of its divisors is an integer number (7537713).

Almost surely, 2^20100566 is an apocalyptic number.

20100566 is a deficient number, since it is larger than the sum of its proper divisors (10050286).

20100566 is a wasteful number, since it uses less digits than its factorization.

20100566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10050285.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20100566 is about 4483.3654769604. The cubic root of 20100566 is about 271.8959647549.

Adding to 20100566 its reverse (66500102), we get a palindrome (86600668).

The spelling of 20100566 in words is "twenty million, one hundred thousand, five hundred sixty-six".