20246563 has 4 divisors (see below), whose sum is σ = 20375680. Its totient is φ = 20117448.

The previous prime is 20246557. The next prime is 20246591. The reversal of 20246563 is 36564202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20246563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20246063) by changing a digit.

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, 64323 + ... + 64636.

It is an arithmetic number, because the mean of its divisors is an integer number (5093920).

Almost surely, 2^20246563 is an apocalyptic number.

20246563 is a deficient number, since it is larger than the sum of its proper divisors (129117).

20246563 is a wasteful number, since it uses less digits than its factorization.

20246563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129116.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20246563 is about 4499.6180949054. The cubic root of 20246563 is about 272.5526672042.

The spelling of 20246563 in words is "twenty million, two hundred forty-six thousand, five hundred sixty-three".