20771766 has 24 divisors (see below), whose sum is σ = 45090864. Its totient is φ = 6910800.

The previous prime is 20771747. The next prime is 20771797. The reversal of 20771766 is 66717702.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20771766.

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, 15316 + ... + 16616.

It is an arithmetic number, because the mean of its divisors is an integer number (1878786).

Almost surely, 2^20771766 is an apocalyptic number.

20771766 is an abundant number, since it is smaller than the sum of its proper divisors (24319098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20771766 is a wasteful number, since it uses less digits than its factorization.

20771766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196 (or 2193 counting only the distinct ones).

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

The square root of 20771766 is about 4557.6052922560. The cubic root of 20771766 is about 274.8892821516.

The spelling of 20771766 in words is "twenty million, seven hundred seventy-one thousand, seven hundred sixty-six".