20771666 has 24 divisors (see below), whose sum is σ = 32915484. Its totient is φ = 9824640.

The previous prime is 20771657. The next prime is 20771683. The reversal of 20771666 is 66617702.

It can be written as a sum of positive squares in 2 ways, for example, as 19616041 + 1155625 = 4429^2 + 1075^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151550 + ... + 151686.

Almost surely, 2^20771666 is an apocalyptic number.

20771666 is a deficient number, since it is larger than the sum of its proper divisors (12143818).

20771666 is a wasteful number, since it uses less digits than its factorization.

20771666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 20771666 is about 4557.5943215692. The cubic root of 20771666 is about 274.8888410244. Note that the first 4 decimals are identical.

The spelling of 20771666 in words is "twenty million, seven hundred seventy-one thousand, six hundred sixty-six".