20997059 has 2 divisors, whose sum is σ = 20997060. Its totient is φ = 20997058.

The previous prime is 20997047. The next prime is 20997101. The reversal of 20997059 is 95079902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20997059 - 2⁸ = 20996803 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20997659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10498529 + 10498530.

It is an arithmetic number, because the mean of its divisors is an integer number (10498530).

Almost surely, 2^20997059 is an apocalyptic number.

20997059 is a deficient number, since it is larger than the sum of its proper divisors (1).

20997059 is an equidigital number, since it uses as much as digits as its factorization.

20997059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 20997059 is about 4582.2547943125. The cubic root of 20997059 is about 275.8795376781.

The spelling of 20997059 in words is "twenty million, nine hundred ninety-seven thousand, fifty-nine".