20666516126 has 16 divisors (see below), whose sum is σ = 31051470528. Its totient is φ = 10316042400.

The previous prime is 20666516033. The next prime is 20666516137. The reversal of 20666516126 is 62161566602.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3837956 + ... + 3843336.

It is an arithmetic number, because the mean of its divisors is an integer number (1940716908).

Almost surely, 2^20666516126 is an apocalyptic number.

20666516126 is a deficient number, since it is larger than the sum of its proper divisors (10384954402).

20666516126 is a wasteful number, since it uses less digits than its factorization.

20666516126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8227.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 20666516126 in words is "twenty billion, six hundred sixty-six million, five hundred sixteen thousand, one hundred twenty-six".