20716628 has 12 divisors (see below), whose sum is σ = 36365952. Its totient is φ = 10326360.

The previous prime is 20716627. The next prime is 20716639. The reversal of 20716628 is 82661702.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20716594 and 20716603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6500 + ... + 9147.

It is an arithmetic number, because the mean of its divisors is an integer number (3030496).

Almost surely, 2^20716628 is an apocalyptic number.

It is an amenable number.

20716628 is a deficient number, since it is larger than the sum of its proper divisors (15649324).

20716628 is a wasteful number, since it uses less digits than its factorization.

20716628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15982 (or 15980 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20716628 is about 4551.5522626902. The cubic root of 20716628 is about 274.6458382997.

The spelling of 20716628 in words is "twenty million, seven hundred sixteen thousand, six hundred twenty-eight".