20645585 has 8 divisors (see below), whose sum is σ = 24844416. Its totient is φ = 16470000.

The previous prime is 20645579. The next prime is 20645671. The reversal of 20645585 is 58554602.

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

It is not a de Polignac number, because 20645585 - 2¹⁴ = 20629201 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3791 + ... + 7460.

It is an arithmetic number, because the mean of its divisors is an integer number (3105552).

Almost surely, 2^20645585 is an apocalyptic number.

It is an amenable number.

20645585 is a deficient number, since it is larger than the sum of its proper divisors (4198831).

20645585 is a wasteful number, since it uses less digits than its factorization.

20645585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11623.

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 20645585 is about 4543.7412998541. The cubic root of 20645585 is about 274.3315334412.

The spelling of 20645585 in words is "twenty million, six hundred forty-five thousand, five hundred eighty-five".