20768399 has 2 divisors, whose sum is σ = 20768400. Its totient is φ = 20768398.

The previous prime is 20768393. The next prime is 20768411. The reversal of 20768399 is 99386702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20768399 - 2¹⁶ = 20702863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20768393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10384199 + 10384200.

It is an arithmetic number, because the mean of its divisors is an integer number (10384200).

Almost surely, 2^20768399 is an apocalyptic number.

20768399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20768399 is an equidigital number, since it uses as much as digits as its factorization.

20768399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 20768399 is about 4557.2358947064. The cubic root of 20768399 is about 274.8744286203.

The spelling of 20768399 in words is "twenty million, seven hundred sixty-eight thousand, three hundred ninety-nine".