20723359 has 4 divisors (see below), whose sum is σ = 20985760. Its totient is φ = 20460960.

The previous prime is 20723317. The next prime is 20723393. The reversal of 20723359 is 95332702.

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 20723359 - 2⁷ = 20723231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20723359.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20723399) 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, 131082 + ... + 131239.

It is an arithmetic number, because the mean of its divisors is an integer number (5246440).

Almost surely, 2^20723359 is an apocalyptic number.

20723359 is a deficient number, since it is larger than the sum of its proper divisors (262401).

20723359 is an equidigital number, since it uses as much as digits as its factorization.

20723359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262400.

The product of its (nonzero) digits is 11340, while the sum is 31.

The square root of 20723359 is about 4552.2916207115. The cubic root of 20723359 is about 274.6755799636.

The spelling of 20723359 in words is "twenty million, seven hundred twenty-three thousand, three hundred fifty-nine".