20575563 has 12 divisors (see below), whose sum is σ = 28172088. Its totient is φ = 13349760.

The previous prime is 20575523. The next prime is 20575567. The reversal of 20575563 is 36557502.

It is not a de Polignac number, because 20575563 - 2¹⁶ = 20510027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20575567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50103 + ... + 50511.

It is an arithmetic number, because the mean of its divisors is an integer number (2347674).

Almost surely, 2^20575563 is an apocalyptic number.

20575563 is a deficient number, since it is larger than the sum of its proper divisors (7596525).

20575563 is an frugal number, since it uses more digits than its factorization.

20575563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 33.

The square root of 20575563 is about 4536.0294311215. The cubic root of 20575563 is about 274.0210392852.

The spelling of 20575563 in words is "twenty million, five hundred seventy-five thousand, five hundred sixty-three".