20428585 has 16 divisors (see below), whose sum is σ = 25214976. Its totient is φ = 15882048.

The previous prime is 20428579. The next prime is 20428589. The reversal of 20428585 is 58582402.

It is a cyclic number.

It is not a de Polignac number, because 20428585 - 2²¹ = 18331433 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 20428585.

It is not an unprimeable number, because it can be changed into a prime (20428589) 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, 33352 + ... + 33958.

It is an arithmetic number, because the mean of its divisors is an integer number (1575936).

Almost surely, 2^20428585 is an apocalyptic number.

It is an amenable number.

20428585 is a deficient number, since it is larger than the sum of its proper divisors (4786391).

20428585 is a wasteful number, since it uses less digits than its factorization.

20428585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792.

The product of its (nonzero) digits is 25600, while the sum is 34.

The square root of 20428585 is about 4519.7992212044. The cubic root of 20428585 is about 273.3670054029.

The spelling of 20428585 in words is "twenty million, four hundred twenty-eight thousand, five hundred eighty-five".