20599849 has 2 divisors, whose sum is σ = 20599850. Its totient is φ = 20599848.

The previous prime is 20599823. The next prime is 20599867. The reversal of 20599849 is 94899502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16160400 + 4439449 = 4020^2 + 2107^2 .

It is a cyclic number.

It is not a de Polignac number, because 20599849 - 2²¹ = 18502697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20599799 and 20599808.

It is not a weakly prime, because it can be changed into another prime (20599879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10299924 + 10299925.

It is an arithmetic number, because the mean of its divisors is an integer number (10299925).

Almost surely, 2^20599849 is an apocalyptic number.

It is an amenable number.

20599849 is a deficient number, since it is larger than the sum of its proper divisors (1).

20599849 is an equidigital number, since it uses as much as digits as its factorization.

20599849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 20599849 is about 4538.7056524961. The cubic root of 20599849 is about 274.1288088491.

The spelling of 20599849 in words is "twenty million, five hundred ninety-nine thousand, eight hundred forty-nine".