20516466 has 16 divisors (see below), whose sum is σ = 43192800. Its totient is φ = 6478848.

The previous prime is 20516423. The next prime is 20516471. The reversal of 20516466 is 66461502.

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, 89871 + ... + 90098.

It is an arithmetic number, because the mean of its divisors is an integer number (2699550).

Almost surely, 2^20516466 is an apocalyptic number.

20516466 is an abundant number, since it is smaller than the sum of its proper divisors (22676334).

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

20516466 is a wasteful number, since it uses less digits than its factorization.

20516466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179993.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20516466 is about 4529.5105695870. The cubic root of 20516466 is about 273.7584405562.

Adding to 20516466 its reverse (66461502), we get a palindrome (86977968).

The spelling of 20516466 in words is "twenty million, five hundred sixteen thousand, four hundred sixty-six".