20771656 has 16 divisors (see below), whose sum is σ = 40290300. Its totient is φ = 10027584.

The previous prime is 20771651. The next prime is 20771657. The reversal of 20771656 is 65617702.

It can be written as a sum of positive squares in 2 ways, for example, as 18783556 + 1988100 = 4334^2 + 1410^2 .

It is not an unprimeable number, because it can be changed into a prime (20771651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44535 + ... + 44998.

Almost surely, 2^20771656 is an apocalyptic number.

It is an amenable number.

20771656 is a deficient number, since it is larger than the sum of its proper divisors (19518644).

20771656 is a wasteful number, since it uses less digits than its factorization.

20771656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89568 (or 89564 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20771656 is about 4557.5932244991. The cubic root of 20771656 is about 274.8887969116. Note that the first 3 decimals are identical.

The spelling of 20771656 in words is "twenty million, seven hundred seventy-one thousand, six hundred fifty-six".