20563916 has 6 divisors (see below), whose sum is σ = 35986860. Its totient is φ = 10281956.

The previous prime is 20563913. The next prime is 20563969. The reversal of 20563916 is 61936502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20563913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2570486 + ... + 2570493.

It is an arithmetic number, because the mean of its divisors is an integer number (5997810).

Almost surely, 2^20563916 is an apocalyptic number.

It is an amenable number.

20563916 is a deficient number, since it is larger than the sum of its proper divisors (15422944).

20563916 is a wasteful number, since it uses less digits than its factorization.

20563916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5140983 (or 5140981 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 20563916 is about 4534.7454173305. The cubic root of 20563916 is about 273.9693254239.

The spelling of 20563916 in words is "twenty million, five hundred sixty-three thousand, nine hundred sixteen".