20479369 has 2 divisors, whose sum is σ = 20479370. Its totient is φ = 20479368.

The previous prime is 20479367. The next prime is 20479379. The reversal of 20479369 is 96397402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15303744 + 5175625 = 3912^2 + 2275^2 .

It is a cyclic number.

It is not a de Polignac number, because 20479369 - 2¹ = 20479367 is a prime.

It is a super-2 number, since 2×20479369² = 838809109276322, which contains 22 as substring.

Together with 20479367, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20479363) 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, 10239684 + 10239685.

It is an arithmetic number, because the mean of its divisors is an integer number (10239685).

Almost surely, 2^20479369 is an apocalyptic number.

It is an amenable number.

20479369 is a deficient number, since it is larger than the sum of its proper divisors (1).

20479369 is an equidigital number, since it uses as much as digits as its factorization.

20479369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 20479369 is about 4525.4136827477. The cubic root of 20479369 is about 273.5933415571.

The spelling of 20479369 in words is "twenty million, four hundred seventy-nine thousand, three hundred sixty-nine".