20812766 has 16 divisors (see below), whose sum is σ = 33871824. Its totient is φ = 9534144.

The previous prime is 20812751. The next prime is 20812793. The reversal of 20812766 is 66721802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641 + ... + 6483.

It is an arithmetic number, because the mean of its divisors is an integer number (2116989).

Almost surely, 2^20812766 is an apocalyptic number.

20812766 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20812766 is a deficient number, since it is larger than the sum of its proper divisors (13059058).

20812766 is a wasteful number, since it uses less digits than its factorization.

20812766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5995.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20812766 is about 4562.1010510509. The cubic root of 20812766 is about 275.0700251427.

The spelling of 20812766 in words is "twenty million, eight hundred twelve thousand, seven hundred sixty-six".