20779753 has 2 divisors, whose sum is σ = 20779754. Its totient is φ = 20779752.

The previous prime is 20779751. The next prime is 20779769. The reversal of 20779753 is 35797702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 59049 = 4552^2 + 243^2 .

It is a cyclic number.

It is not a de Polignac number, because 20779753 - 2¹ = 20779751 is a prime.

Together with 20779751, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20779751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10389876 + 10389877.

It is an arithmetic number, because the mean of its divisors is an integer number (10389877).

Almost surely, 2^20779753 is an apocalyptic number.

It is an amenable number.

20779753 is a deficient number, since it is larger than the sum of its proper divisors (1).

20779753 is an equidigital number, since it uses as much as digits as its factorization.

20779753 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92610, while the sum is 40.

The square root of 20779753 is about 4558.4814357415. The cubic root of 20779753 is about 274.9245104089.

The spelling of 20779753 in words is "twenty million, seven hundred seventy-nine thousand, seven hundred fifty-three".