20720599 has 2 divisors, whose sum is σ = 20720600. Its totient is φ = 20720598.

The previous prime is 20720597. The next prime is 20720611. The reversal of 20720599 is 99502702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20720599 - 2¹ = 20720597 is a prime.

Together with 20720597, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20720597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10360299 + 10360300.

It is an arithmetic number, because the mean of its divisors is an integer number (10360300).

Almost surely, 2^20720599 is an apocalyptic number.

20720599 is a deficient number, since it is larger than the sum of its proper divisors (1).

20720599 is an equidigital number, since it uses as much as digits as its factorization.

20720599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 20720599 is about 4551.9884665935. The cubic root of 20720599 is about 274.6633853791.

The spelling of 20720599 in words is "twenty million, seven hundred twenty thousand, five hundred ninety-nine".