20716756 has 12 divisors (see below), whose sum is σ = 36312192. Its totient is φ = 10341848.

The previous prime is 20716753. The next prime is 20716757. The reversal of 20716756 is 65761702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060 + ... + 6523.

It is an arithmetic number, because the mean of its divisors is an integer number (3026016).

Almost surely, 2^20716756 is an apocalyptic number.

It is an amenable number.

20716756 is a deficient number, since it is larger than the sum of its proper divisors (15595436).

20716756 is a wasteful number, since it uses less digits than its factorization.

20716756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8270 (or 8268 counting only the distinct ones).

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

The square root of 20716756 is about 4551.5663238055. The cubic root of 20716756 is about 274.6464039419.

The spelling of 20716756 in words is "twenty million, seven hundred sixteen thousand, seven hundred fifty-six".