20723966 has 16 divisors (see below), whose sum is σ = 32582304. Its totient is φ = 9867264.

The previous prime is 20723939. The next prime is 20723999. The reversal of 20723966 is 66932702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10946 + ... + 12698.

It is an arithmetic number, because the mean of its divisors is an integer number (2036394).

Almost surely, 2^20723966 is an apocalyptic number.

20723966 is a deficient number, since it is larger than the sum of its proper divisors (11858338).

20723966 is a wasteful number, since it uses less digits than its factorization.

20723966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 20723966 is about 4552.3582899416. The cubic root of 20723966 is about 274.6782617433.

The spelling of 20723966 in words is "twenty million, seven hundred twenty-three thousand, nine hundred sixty-six".