20996777 has 2 divisors, whose sum is σ = 20996778. Its totient is φ = 20996776.

The previous prime is 20996753. The next prime is 20996803. The reversal of 20996777 is 77769902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11162281 + 9834496 = 3341^2 + 3136^2 .

It is a cyclic number.

It is not a de Polignac number, because 20996777 - 2⁶ = 20996713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20996477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10498388 + 10498389.

It is an arithmetic number, because the mean of its divisors is an integer number (10498389).

Almost surely, 2^20996777 is an apocalyptic number.

It is an amenable number.

20996777 is a deficient number, since it is larger than the sum of its proper divisors (1).

20996777 is an equidigital number, since it uses as much as digits as its factorization.

20996777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 333396, while the sum is 47.

The square root of 20996777 is about 4582.2240233319. The cubic root of 20996777 is about 275.8783026102.

The spelling of 20996777 in words is "twenty million, nine hundred ninety-six thousand, seven hundred seventy-seven".