20404036500566 has 4 divisors (see below), whose sum is σ = 30606054750852. Its totient is φ = 10202018250282.

The previous prime is 20404036500509. The next prime is 20404036500581. The reversal of 20404036500566 is 66500563040402.

It is a happy number.

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

It is a super-3 number, since 3×20404036500566³ (a number of 41 digits) contains 333 as substring.

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, 5101009125140 + ... + 5101009125143.

It is an arithmetic number, because the mean of its divisors is an integer number (7651513687713).

Almost surely, 2^{20404036500566} is an apocalyptic number.

20404036500566 is a deficient number, since it is larger than the sum of its proper divisors (10202018250286).

20404036500566 is a wasteful number, since it uses less digits than its factorization.

20404036500566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10202018250285.

The product of its (nonzero) digits is 518400, while the sum is 41.

Adding to 20404036500566 its reverse (66500563040402), we get a palindrome (86904599540968).

The spelling of 20404036500566 in words is "twenty trillion, four hundred four billion, thirty-six million, five hundred thousand, five hundred sixty-six".