20892812666 has 16 divisors (see below), whose sum is σ = 34249638240. Its totient is φ = 9479677680.

The previous prime is 20892812659. The next prime is 20892812683. The reversal of 20892812666 is 66621829802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840236 + ... + 864743.

It is an arithmetic number, because the mean of its divisors is an integer number (2140602390).

Almost surely, 2^20892812666 is an apocalyptic number.

20892812666 is a deficient number, since it is larger than the sum of its proper divisors (13356825574).

20892812666 is a wasteful number, since it uses less digits than its factorization.

20892812666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705549.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 20892812666 in words is "twenty billion, eight hundred ninety-two million, eight hundred twelve thousand, six hundred sixty-six".