20185455 has 16 divisors (see below), whose sum is σ = 32408064. Its totient is φ = 10728480.

The previous prime is 20185393. The next prime is 20185463. The reversal of 20185455 is 55458102.

It is not a de Polignac number, because 20185455 - 2⁸ = 20185199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2502 + ... + 6828.

It is an arithmetic number, because the mean of its divisors is an integer number (2025504).

Almost surely, 2^20185455 is an apocalyptic number.

20185455 is a deficient number, since it is larger than the sum of its proper divisors (12222609).

20185455 is a wasteful number, since it uses less digits than its factorization.

20185455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4646.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 20185455 is about 4492.8226094517. The cubic root of 20185455 is about 272.2781855110.

The spelling of 20185455 in words is "twenty million, one hundred eighty-five thousand, four hundred fifty-five".