20773691 has 4 divisors (see below), whose sum is σ = 20835672. Its totient is φ = 20711712.

The previous prime is 20773681. The next prime is 20773699. The reversal of 20773691 is 19637702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20773691 - 2¹⁰ = 20772667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20773699) 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, 30485 + ... + 31158.

It is an arithmetic number, because the mean of its divisors is an integer number (5208918).

Almost surely, 2^20773691 is an apocalyptic number.

20773691 is a deficient number, since it is larger than the sum of its proper divisors (61981).

20773691 is an equidigital number, since it uses as much as digits as its factorization.

20773691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61980.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 20773691 is about 4557.8164728299. The cubic root of 20773691 is about 274.8977735741.

The spelling of 20773691 in words is "twenty million, seven hundred seventy-three thousand, six hundred ninety-one".