20365559 has 2 divisors, whose sum is σ = 20365560. Its totient is φ = 20365558.

The previous prime is 20365547. The next prime is 20365567. The reversal of 20365559 is 95556302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20365559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20365589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10182779 + 10182780.

It is an arithmetic number, because the mean of its divisors is an integer number (10182780).

Almost surely, 2^20365559 is an apocalyptic number.

20365559 is a deficient number, since it is larger than the sum of its proper divisors (1).

20365559 is an equidigital number, since it uses as much as digits as its factorization.

20365559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40500, while the sum is 35.

The square root of 20365559 is about 4512.8216228874. The cubic root of 20365559 is about 273.0855863721.

The spelling of 20365559 in words is "twenty million, three hundred sixty-five thousand, five hundred fifty-nine".