20673773 has 4 divisors (see below), whose sum is σ = 20687580. Its totient is φ = 20659968.

The previous prime is 20673769. The next prime is 20673797. The reversal of 20673773 is 37737602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1898884 + 18774889 = 1378^2 + 4333^2 .

It is a cyclic number.

It is not a de Polignac number, because 20673773 - 2² = 20673769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20673973) 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, 4340 + ... + 7757.

It is an arithmetic number, because the mean of its divisors is an integer number (5171895).

Almost surely, 2^20673773 is an apocalyptic number.

It is an amenable number.

20673773 is a deficient number, since it is larger than the sum of its proper divisors (13807).

20673773 is a wasteful number, since it uses less digits than its factorization.

20673773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13806.

The product of its (nonzero) digits is 37044, while the sum is 35.

The square root of 20673773 is about 4546.8420909462. The cubic root of 20673773 is about 274.4563275257.

The spelling of 20673773 in words is "twenty million, six hundred seventy-three thousand, seven hundred seventy-three".