20959597 has 2 divisors, whose sum is σ = 20959598. Its totient is φ = 20959596.

The previous prime is 20959567. The next prime is 20959613. The reversal of 20959597 is 79595902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19838116 + 1121481 = 4454^2 + 1059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20959597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20959517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10479798 + 10479799.

It is an arithmetic number, because the mean of its divisors is an integer number (10479799).

Almost surely, 2^20959597 is an apocalyptic number.

It is an amenable number.

20959597 is a deficient number, since it is larger than the sum of its proper divisors (1).

20959597 is an equidigital number, since it uses as much as digits as its factorization.

20959597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 255150, while the sum is 46.

The square root of 20959597 is about 4578.1652438504. The cubic root of 20959597 is about 275.7153694208.

The spelling of 20959597 in words is "twenty million, nine hundred fifty-nine thousand, five hundred ninety-seven".