20563147 has 8 divisors (see below), whose sum is σ = 22717440. Its totient is φ = 18456360.

The previous prime is 20563141. The next prime is 20563163. The reversal of 20563147 is 74136502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20563147 - 2³ = 20563139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20563141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10963 + ... + 12700.

It is an arithmetic number, because the mean of its divisors is an integer number (2839680).

Almost surely, 2^20563147 is an apocalyptic number.

20563147 is a deficient number, since it is larger than the sum of its proper divisors (2154293).

20563147 is a wasteful number, since it uses less digits than its factorization.

20563147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23753.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20563147 is about 4534.6606267724. The cubic root of 20563147 is about 273.9659102988.

Adding to 20563147 its reverse (74136502), we get a palindrome (94699649).

The spelling of 20563147 in words is "twenty million, five hundred sixty-three thousand, one hundred forty-seven".