20780759 has 2 divisors, whose sum is σ = 20780760. Its totient is φ = 20780758.

The previous prime is 20780743. The next prime is 20780761. The reversal of 20780759 is 95708702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20780759 - 2⁴ = 20780743 is a prime.

Together with 20780761, 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 (20780729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10390379 + 10390380.

It is an arithmetic number, because the mean of its divisors is an integer number (10390380).

Almost surely, 2^20780759 is an apocalyptic number.

20780759 is a deficient number, since it is larger than the sum of its proper divisors (1).

20780759 is an equidigital number, since it uses as much as digits as its factorization.

20780759 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 20780759 is about 4558.5917781701. The cubic root of 20780759 is about 274.9289469325.

The spelling of 20780759 in words is "twenty million, seven hundred eighty thousand, seven hundred fifty-nine".