20490599 has 2 divisors, whose sum is σ = 20490600. Its totient is φ = 20490598.

The previous prime is 20490557. The next prime is 20490601. The reversal of 20490599 is 99509402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20490599 - 2⁸ = 20490343 is a prime.

Together with 20490601, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20490199) 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, 10245299 + 10245300.

It is an arithmetic number, because the mean of its divisors is an integer number (10245300).

Almost surely, 2^20490599 is an apocalyptic number.

20490599 is a deficient number, since it is larger than the sum of its proper divisors (1).

20490599 is an equidigital number, since it uses as much as digits as its factorization.

20490599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 20490599 is about 4526.6542832428. The cubic root of 20490599 is about 273.6433413365.

The spelling of 20490599 in words is "twenty million, four hundred ninety thousand, five hundred ninety-nine".