20766705 has 16 divisors (see below), whose sum is σ = 34038144. Its totient is φ = 10805120.

The previous prime is 20766701. The next prime is 20766751. The reversal of 20766705 is 50766702.

It is not a de Polignac number, because 20766705 - 2² = 20766701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20766701) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16269 + ... + 17498.

It is an arithmetic number, because the mean of its divisors is an integer number (2127384).

Almost surely, 2^20766705 is an apocalyptic number.

It is an amenable number.

20766705 is a deficient number, since it is larger than the sum of its proper divisors (13271439).

20766705 is a wasteful number, since it uses less digits than its factorization.

20766705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33816.

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 20766705 is about 4557.0500326417. The cubic root of 20766705 is about 274.8669549269.

The spelling of 20766705 in words is "twenty million, seven hundred sixty-six thousand, seven hundred five".