20563057 has 4 divisors (see below), whose sum is σ = 20667636. Its totient is φ = 20458480.

The previous prime is 20563027. The next prime is 20563069. The reversal of 20563057 is 75036502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75036502 = 2 ⋅37518251.

It can be written as a sum of positive squares in 2 ways, for example, as 18054001 + 2509056 = 4249^2 + 1584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20563057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20563007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51994 + ... + 52387.

It is an arithmetic number, because the mean of its divisors is an integer number (5166909).

Almost surely, 2^20563057 is an apocalyptic number.

It is an amenable number.

20563057 is a deficient number, since it is larger than the sum of its proper divisors (104579).

20563057 is a wasteful number, since it uses less digits than its factorization.

20563057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104578.

The product of its (nonzero) digits is 6300, while the sum is 28.

The square root of 20563057 is about 4534.6507031964. The cubic root of 20563057 is about 273.9655106037.

Adding to 20563057 its reverse (75036502), we get a palindrome (95599559).

The spelling of 20563057 in words is "twenty million, five hundred sixty-three thousand, fifty-seven".