20446399 has 2 divisors, whose sum is σ = 20446400. Its totient is φ = 20446398.

The previous prime is 20446397. The next prime is 20446411. The reversal of 20446399 is 99364402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20446399 - 2¹ = 20446397 is a prime.

Together with 20446397, 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 (20446397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10223199 + 10223200.

It is an arithmetic number, because the mean of its divisors is an integer number (10223200).

Almost surely, 2^20446399 is an apocalyptic number.

20446399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20446399 is an equidigital number, since it uses as much as digits as its factorization.

20446399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 20446399 is about 4521.7694545388. The cubic root of 20446399 is about 273.4464422153.

The spelling of 20446399 in words is "twenty million, four hundred forty-six thousand, three hundred ninety-nine".