20855345 has 16 divisors (see below), whose sum is σ = 30284928. Its totient is φ = 13459200.

The previous prime is 20855333. The next prime is 20855371. The reversal of 20855345 is 54355802.

It is not a de Polignac number, because 20855345 - 2²⁰ = 19806769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16931 + ... + 18120.

It is an arithmetic number, because the mean of its divisors is an integer number (1892808).

Almost surely, 2^20855345 is an apocalyptic number.

It is an amenable number.

20855345 is a deficient number, since it is larger than the sum of its proper divisors (9429583).

20855345 is a wasteful number, since it uses less digits than its factorization.

20855345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35080.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 20855345 is about 4566.7652665755. The cubic root of 20855345 is about 275.2574778608.

The spelling of 20855345 in words is "twenty million, eight hundred fifty-five thousand, three hundred forty-five".