20563212 has 12 divisors (see below), whose sum is σ = 47980856. Its totient is φ = 6854400.

The previous prime is 20563189. The next prime is 20563237. The reversal of 20563212 is 21236502.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 856789 + ... + 856812.

Almost surely, 2^20563212 is an apocalyptic number.

It is an amenable number.

20563212 is an abundant number, since it is smaller than the sum of its proper divisors (27417644).

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

20563212 is a wasteful number, since it uses less digits than its factorization.

20563212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713608 (or 1713606 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20563212 is about 4534.6677937860. The cubic root of 20563212 is about 273.9661989668.

Adding to 20563212 its reverse (21236502), we get a palindrome (41799714).

The spelling of 20563212 in words is "twenty million, five hundred sixty-three thousand, two hundred twelve".