20120566 has 4 divisors (see below), whose sum is σ = 30180852. Its totient is φ = 10060282.

The previous prime is 20120543. The next prime is 20120623. The reversal of 20120566 is 66502102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66502102 = 2 ⋅33251051.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5030140 + ... + 5030143.

It is an arithmetic number, because the mean of its divisors is an integer number (7545213).

Almost surely, 2^20120566 is an apocalyptic number.

20120566 is a deficient number, since it is larger than the sum of its proper divisors (10060286).

20120566 is a wasteful number, since it uses less digits than its factorization.

20120566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10060285.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20120566 is about 4485.5953896891. The cubic root of 20120566 is about 271.9861134058.

Adding to 20120566 its reverse (66502102), we get a palindrome (86622668).

The spelling of 20120566 in words is "twenty million, one hundred twenty thousand, five hundred sixty-six".