20731367 has 4 divisors (see below), whose sum is σ = 20742456. Its totient is φ = 20720280.

The previous prime is 20731351. The next prime is 20731391. The reversal of 20731367 is 76313702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20731367 - 2⁴ = 20731351 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 (20731307) 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, 1973 + ... + 6734.

It is an arithmetic number, because the mean of its divisors is an integer number (5185614).

Almost surely, 2^20731367 is an apocalyptic number.

20731367 is a deficient number, since it is larger than the sum of its proper divisors (11089).

20731367 is an equidigital number, since it uses as much as digits as its factorization.

20731367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11088.

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

The square root of 20731367 is about 4553.1710927660. The cubic root of 20731367 is about 274.7109558049.

The spelling of 20731367 in words is "twenty million, seven hundred thirty-one thousand, three hundred sixty-seven".