20766771 has 6 divisors (see below), whose sum is σ = 29996460. Its totient is φ = 13844508.

The previous prime is 20766751. The next prime is 20766773. The reversal of 20766771 is 17766702.

It is not a de Polignac number, because 20766771 - 2¹³ = 20758579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20766773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1153701 + ... + 1153718.

It is an arithmetic number, because the mean of its divisors is an integer number (4999410).

Almost surely, 2^20766771 is an apocalyptic number.

20766771 is a deficient number, since it is larger than the sum of its proper divisors (9229689).

20766771 is a wasteful number, since it uses less digits than its factorization.

20766771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307425 (or 2307422 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 20766771 is about 4557.0572741628. The cubic root of 20766771 is about 274.8672461174.

The spelling of 20766771 in words is "twenty million, seven hundred sixty-six thousand, seven hundred seventy-one".