20555585 has 8 divisors (see below), whose sum is σ = 24861696. Its totient is φ = 16314480.

The previous prime is 20555581. The next prime is 20555599. The reversal of 20555585 is 58555502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20555585 - 2² = 20555581 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20555581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15551 + ... + 16820.

It is an arithmetic number, because the mean of its divisors is an integer number (3107712).

Almost surely, 2^20555585 is an apocalyptic number.

It is an amenable number.

20555585 is a deficient number, since it is larger than the sum of its proper divisors (4306111).

20555585 is a wasteful number, since it uses less digits than its factorization.

20555585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32503.

The product of its (nonzero) digits is 50000, while the sum is 35.

The square root of 20555585 is about 4533.8267501086. The cubic root of 20555585 is about 273.9323229590.

The spelling of 20555585 in words is "twenty million, five hundred fifty-five thousand, five hundred eighty-five".