20776489 has 2 divisors, whose sum is σ = 20776490. Its totient is φ = 20776488.

The previous prime is 20776471. The next prime is 20776523. The reversal of 20776489 is 98467702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12482089 + 8294400 = 3533^2 + 2880^2 .

It is a cyclic number.

It is not a de Polignac number, because 20776489 - 2⁷ = 20776361 is a prime.

It is not a weakly prime, because it can be changed into another prime (20776589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10388244 + 10388245.

It is an arithmetic number, because the mean of its divisors is an integer number (10388245).

Almost surely, 2^20776489 is an apocalyptic number.

It is an amenable number.

20776489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20776489 is an equidigital number, since it uses as much as digits as its factorization.

20776489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 20776489 is about 4558.1234077195. The cubic root of 20776489 is about 274.9101149765.

The spelling of 20776489 in words is "twenty million, seven hundred seventy-six thousand, four hundred eighty-nine".