20563501 has 4 divisors (see below), whose sum is σ = 23501152. Its totient is φ = 17625852.

The previous prime is 20563493. The next prime is 20563511. The reversal of 20563501 is 10536502.

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 20563501 - 2³ = 20563493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563511) 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 3 ways as a sum of consecutive naturals, for example, 1468815 + ... + 1468828.

It is an arithmetic number, because the mean of its divisors is an integer number (5875288).

Almost surely, 2^20563501 is an apocalyptic number.

It is an amenable number.

20563501 is a deficient number, since it is larger than the sum of its proper divisors (2937651).

20563501 is an equidigital number, since it uses as much as digits as its factorization.

20563501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2937650.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20563501 is about 4534.6996592939. The cubic root of 20563501 is about 273.9674824216.

The spelling of 20563501 in words is "twenty million, five hundred sixty-three thousand, five hundred one".