20563169 has 4 divisors (see below), whose sum is σ = 22432560. Its totient is φ = 18693780.

The previous prime is 20563163. The next prime is 20563189. The reversal of 20563169 is 96136502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20563169 - 2²⁴ = 3785953 is a prime.

It is a super-2 number, since 2×20563169² = 845687838645122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20563163) 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, 934679 + ... + 934700.

It is an arithmetic number, because the mean of its divisors is an integer number (5608140).

Almost surely, 2^20563169 is an apocalyptic number.

It is an amenable number.

20563169 is a deficient number, since it is larger than the sum of its proper divisors (1869391).

20563169 is a wasteful number, since it uses less digits than its factorization.

20563169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1869390.

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

The square root of 20563169 is about 4534.6630525321. The cubic root of 20563169 is about 273.9660080019.

It can be divided in two parts, 2056 and 3169, that added together give a palindrome (5225).

The spelling of 20563169 in words is "twenty million, five hundred sixty-three thousand, one hundred sixty-nine".