20716808 has 48 divisors (see below), whose sum is σ = 46323900. Its totient is φ = 8655360.

The previous prime is 20716789. The next prime is 20716873. The reversal of 20716808 is 80861702.

It can be written as a sum of positive squares in 2 ways, for example, as 20448484 + 268324 = 4522^2 + 518^2 .

It is a super-2 number, since 2×20716808² = 858372267417728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15428 + ... + 16716.

Almost surely, 2^20716808 is an apocalyptic number.

20716808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20716808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23161950).

20716808 is an abundant number, since it is smaller than the sum of its proper divisors (25607092).

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

20716808 is a wasteful number, since it uses less digits than its factorization.

20716808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350 (or 1339 counting only the distinct ones).

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

The square root of 20716808 is about 4551.5720361211. The cubic root of 20716808 is about 274.6466337334.

The spelling of 20716808 in words is "twenty million, seven hundred sixteen thousand, eight hundred eight".