20306773 has 4 divisors (see below), whose sum is σ = 20738880. Its totient is φ = 19874668.

The previous prime is 20306771. The next prime is 20306777. The reversal of 20306773 is 37760302.

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 20306773 - 2¹ = 20306771 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 (20306771) 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, 215983 + ... + 216076.

It is an arithmetic number, because the mean of its divisors is an integer number (5184720).

Almost surely, 2^20306773 is an apocalyptic number.

It is an amenable number.

20306773 is a deficient number, since it is larger than the sum of its proper divisors (432107).

20306773 is an equidigital number, since it uses as much as digits as its factorization.

20306773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432106.

The product of its (nonzero) digits is 5292, while the sum is 28.

The square root of 20306773 is about 4506.3036959353. The cubic root of 20306773 is about 272.8225756594.

The spelling of 20306773 in words is "twenty million, three hundred six thousand, seven hundred seventy-three".