20340559 has 2 divisors, whose sum is σ = 20340560. Its totient is φ = 20340558.

The previous prime is 20340553. The next prime is 20340563. The reversal of 20340559 is 95504302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20340559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20340553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170279 + 10170280.

It is an arithmetic number, because the mean of its divisors is an integer number (10170280).

Almost surely, 2^20340559 is an apocalyptic number.

20340559 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340559 is an equidigital number, since it uses as much as digits as its factorization.

20340559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 20340559 is about 4510.0508866309. The cubic root of 20340559 is about 272.9737973930.

The spelling of 20340559 in words is "twenty million, three hundred forty thousand, five hundred fifty-nine".