20726779 has 2 divisors, whose sum is σ = 20726780. Its totient is φ = 20726778.

The previous prime is 20726773. The next prime is 20726789. The reversal of 20726779 is 97762702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20726779 - 2⁹ = 20726267 is a prime.

It is not a weakly prime, because it can be changed into another prime (20726773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363389 + 10363390.

It is an arithmetic number, because the mean of its divisors is an integer number (10363390).

Almost surely, 2^20726779 is an apocalyptic number.

20726779 is a deficient number, since it is larger than the sum of its proper divisors (1).

20726779 is an equidigital number, since it uses as much as digits as its factorization.

20726779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 20726779 is about 4552.6672402011. The cubic root of 20726779 is about 274.6906891425.

The spelling of 20726779 in words is "twenty million, seven hundred twenty-six thousand, seven hundred seventy-nine".