20716956 has 36 divisors (see below), whose sum is σ = 56397432. Its totient is φ = 6374304.

The previous prime is 20716921. The next prime is 20716961. The reversal of 20716956 is 65961702.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20716956.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 21666 + ... + 22601.

Almost surely, 2^20716956 is an apocalyptic number.

20716956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20716956 is an abundant number, since it is smaller than the sum of its proper divisors (35680476).

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

20716956 is a wasteful number, since it uses less digits than its factorization.

20716956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44290 (or 44285 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20716956 is about 4551.5882942112. The cubic root of 20716956 is about 274.6472877531.

The spelling of 20716956 in words is "twenty million, seven hundred sixteen thousand, nine hundred fifty-six".