20731673 has 4 divisors (see below), whose sum is σ = 20747520. Its totient is φ = 20715828.

The previous prime is 20731663. The next prime is 20731681. The reversal of 20731673 is 37613702.

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 20731673 - 2¹⁸ = 20469529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20731663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5765 + ... + 8642.

It is an arithmetic number, because the mean of its divisors is an integer number (5186880).

Almost surely, 2^20731673 is an apocalyptic number.

It is an amenable number.

20731673 is a deficient number, since it is larger than the sum of its proper divisors (15847).

20731673 is a wasteful number, since it uses less digits than its factorization.

20731673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15846.

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 20731673 is about 4553.2046955963. The cubic root of 20731673 is about 274.7123073984.

The spelling of 20731673 in words is "twenty million, seven hundred thirty-one thousand, six hundred seventy-three".