20965577 has 2 divisors, whose sum is σ = 20965578. Its totient is φ = 20965576.

The previous prime is 20965537. The next prime is 20965597. The reversal of 20965577 is 77556902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12503296 + 8462281 = 3536^2 + 2909^2 .

It is a cyclic number.

It is not a de Polignac number, because 20965577 - 2⁶ = 20965513 is a prime.

It is not a weakly prime, because it can be changed into another prime (20965507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10482788 + 10482789.

It is an arithmetic number, because the mean of its divisors is an integer number (10482789).

Almost surely, 2^20965577 is an apocalyptic number.

It is an amenable number.

20965577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20965577 is an equidigital number, since it uses as much as digits as its factorization.

20965577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132300, while the sum is 41.

The square root of 20965577 is about 4578.8182973339. The cubic root of 20965577 is about 275.7415884543.

The spelling of 20965577 in words is "twenty million, nine hundred sixty-five thousand, five hundred seventy-seven".