20471855 has 8 divisors (see below), whose sum is σ = 24732000. Its totient is φ = 16266976.

The previous prime is 20471821. The next prime is 20471881. The reversal of 20471855 is 55817402.

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

It is a cyclic number.

It is not a de Polignac number, because 20471855 - 2⁸ = 20471599 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 7 ways as a sum of consecutive naturals, for example, 12995 + ... + 14484.

It is an arithmetic number, because the mean of its divisors is an integer number (3091500).

Almost surely, 2^20471855 is an apocalyptic number.

20471855 is a deficient number, since it is larger than the sum of its proper divisors (4260145).

20471855 is a wasteful number, since it uses less digits than its factorization.

20471855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27633.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 20471855 is about 4524.5834062375. The cubic root of 20471855 is about 273.5598764660.

The spelling of 20471855 in words is "twenty million, four hundred seventy-one thousand, eight hundred fifty-five".