20807573 has 4 divisors (see below), whose sum is σ = 21071040. Its totient is φ = 20544108.

The previous prime is 20807569. The next prime is 20807581. The reversal of 20807573 is 37570802.

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 not a de Polignac number, because 20807573 - 2² = 20807569 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 (20807503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131615 + ... + 131772.

It is an arithmetic number, because the mean of its divisors is an integer number (5267760).

Almost surely, 2^20807573 is an apocalyptic number.

It is an amenable number.

20807573 is a deficient number, since it is larger than the sum of its proper divisors (263467).

20807573 is an equidigital number, since it uses as much as digits as its factorization.

20807573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263466.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 20807573 is about 4561.5318698876. The cubic root of 20807573 is about 275.0471456360.

The spelling of 20807573 in words is "twenty million, eight hundred seven thousand, five hundred seventy-three".