20559885 has 16 divisors (see below), whose sum is σ = 34831296. Its totient is φ = 10320128.

The previous prime is 20559883. The next prime is 20559887. The reversal of 20559885 is 58895502.

It is an interprime number because it is at equal distance from previous prime (20559883) and next prime (20559887).

It is a cyclic number.

It is not a de Polignac number, because 20559885 - 2¹ = 20559883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20559883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40059 + ... + 40568.

It is an arithmetic number, because the mean of its divisors is an integer number (2176956).

Almost surely, 2^20559885 is an apocalyptic number.

It is an amenable number.

20559885 is a deficient number, since it is larger than the sum of its proper divisors (14271411).

20559885 is a wasteful number, since it uses less digits than its factorization.

20559885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80652.

The product of its (nonzero) digits is 144000, while the sum is 42.

The square root of 20559885 is about 4534.3009384027. The cubic root of 20559885 is about 273.9514228267.

The spelling of 20559885 in words is "twenty million, five hundred fifty-nine thousand, eight hundred eighty-five".