20724359 has 2 divisors, whose sum is σ = 20724360. Its totient is φ = 20724358.

The previous prime is 20724349. The next prime is 20724367. The reversal of 20724359 is 95342702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20724359 - 2²⁴ = 3947143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20724349) 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 as a sum of consecutive naturals, namely, 10362179 + 10362180.

It is an arithmetic number, because the mean of its divisors is an integer number (10362180).

Almost surely, 2^20724359 is an apocalyptic number.

20724359 is a deficient number, since it is larger than the sum of its proper divisors (1).

20724359 is an equidigital number, since it uses as much as digits as its factorization.

20724359 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20724359 is about 4552.4014541778. The cubic root of 20724359 is about 274.6799980241.

The spelling of 20724359 in words is "twenty million, seven hundred twenty-four thousand, three hundred fifty-nine".