20602559 has 4 divisors (see below), whose sum is σ = 20691216. Its totient is φ = 20513904.

The previous prime is 20602523. The next prime is 20602577. The reversal of 20602559 is 95520602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20602559 - 2²⁴ = 3825343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20602579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43979 + ... + 44444.

It is an arithmetic number, because the mean of its divisors is an integer number (5172804).

Almost surely, 2^20602559 is an apocalyptic number.

20602559 is a deficient number, since it is larger than the sum of its proper divisors (88657).

20602559 is an equidigital number, since it uses as much as digits as its factorization.

20602559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88656.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 20602559 is about 4539.0041859421. The cubic root of 20602559 is about 274.1408292689.

The spelling of 20602559 in words is "twenty million, six hundred two thousand, five hundred fifty-nine".