20716880 has 40 divisors (see below), whose sum is σ = 51003432. Its totient is φ = 7798784.

The previous prime is 20716873. The next prime is 20716907. The reversal of 20716880 is 8861702.

It can be written as a sum of positive squares in 4 ways, for example, as 1567504 + 19149376 = 1252^2 + 4376^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6257 + ... + 8976.

Almost surely, 2^20716880 is an apocalyptic number.

20716880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20716880 is an abundant number, since it is smaller than the sum of its proper divisors (30286552).

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

20716880 is a wasteful number, since it uses less digits than its factorization.

20716880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15263 (or 15257 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 20716880 is about 4551.5799454695. The cubic root of 20716880 is about 274.6469519055.

The spelling of 20716880 in words is "twenty million, seven hundred sixteen thousand, eight hundred eighty".