20516568 has 32 divisors (see below), whose sum is σ = 51529200. Its totient is φ = 6807168.

The previous prime is 20516549. The next prime is 20516591. The reversal of 20516568 is 86561502.

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, 3630 + ... + 7362.

Almost surely, 2^20516568 is an apocalyptic number.

It is an amenable number.

20516568 is an abundant number, since it is smaller than the sum of its proper divisors (31012632).

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

20516568 is a wasteful number, since it uses less digits than its factorization.

20516568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971 (or 3967 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 20516568 is about 4529.5218290676. The cubic root of 20516568 is about 273.7588942295.

The spelling of 20516568 in words is "twenty million, five hundred sixteen thousand, five hundred sixty-eight".