20724349 has 2 divisors, whose sum is σ = 20724350. Its totient is φ = 20724348.

The previous prime is 20724287. The next prime is 20724359. The reversal of 20724349 is 94342702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13271449 + 7452900 = 3643^2 + 2730^2 .

It is a cyclic number.

It is not a de Polignac number, because 20724349 - 2¹¹ = 20722301 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20724349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20724359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10362174 + 10362175.

It is an arithmetic number, because the mean of its divisors is an integer number (10362175).

Almost surely, 2^20724349 is an apocalyptic number.

It is an amenable number.

20724349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20724349 is an equidigital number, since it uses as much as digits as its factorization.

20724349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 20724349 is about 4552.4003558562. The cubic root of 20724349 is about 274.6799538442.

The spelling of 20724349 in words is "twenty million, seven hundred twenty-four thousand, three hundred forty-nine".