20412566 has 4 divisors (see below), whose sum is σ = 30618852. Its totient is φ = 10206282.

The previous prime is 20412559. The next prime is 20412599. The reversal of 20412566 is 66521402.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5103140 + ... + 5103143.

It is an arithmetic number, because the mean of its divisors is an integer number (7654713).

Almost surely, 2^20412566 is an apocalyptic number.

20412566 is a deficient number, since it is larger than the sum of its proper divisors (10206286).

20412566 is a wasteful number, since it uses less digits than its factorization.

20412566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10206285.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20412566 is about 4518.0267816825. The cubic root of 20412566 is about 273.2955334733.

Adding to 20412566 its reverse (66521402), we get a palindrome (86933968).

The spelling of 20412566 in words is "twenty million, four hundred twelve thousand, five hundred sixty-six".