20000779 has 2 divisors, whose sum is σ = 20000780. Its totient is φ = 20000778.

The previous prime is 20000753. The next prime is 20000791. The reversal of 20000779 is 97700002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20000779 - 2¹³ = 19992587 is a prime.

It is not a weakly prime, because it can be changed into another prime (20000879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000389 + 10000390.

It is an arithmetic number, because the mean of its divisors is an integer number (10000390).

Almost surely, 2^20000779 is an apocalyptic number.

20000779 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000779 is an equidigital number, since it uses as much as digits as its factorization.

20000779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 882, while the sum is 25.

The square root of 20000779 is about 4472.2230489992. The cubic root of 20000779 is about 271.4452858326.

The spelling of 20000779 in words is "twenty million, seven hundred seventy-nine", and thus it is an aban number.