20532559 has 4 divisors (see below), whose sum is σ = 21613240. Its totient is φ = 19451880.

The previous prime is 20532517. The next prime is 20532569. The reversal of 20532559 is 95523502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95523502 = 2 ⋅47761751.

It is a cyclic number.

It is not a de Polignac number, because 20532559 - 2¹³ = 20524367 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20532559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20532569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540312 + ... + 540349.

It is an arithmetic number, because the mean of its divisors is an integer number (5403310).

Almost surely, 2^20532559 is an apocalyptic number.

20532559 is a deficient number, since it is larger than the sum of its proper divisors (1080681).

20532559 is a wasteful number, since it uses less digits than its factorization.

20532559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080680.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 20532559 is about 4531.2866826101. The cubic root of 20532559 is about 273.8300000405.

The spelling of 20532559 in words is "twenty million, five hundred thirty-two thousand, five hundred fifty-nine".