20456855 has 4 divisors (see below), whose sum is σ = 24548232. Its totient is φ = 16365480.

The previous prime is 20456851. The next prime is 20456879. The reversal of 20456855 is 55865402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55865402 = 2 ⋅27932701.

It is not a de Polignac number, because 20456855 - 2² = 20456851 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20456851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2045681 + ... + 2045690.

It is an arithmetic number, because the mean of its divisors is an integer number (6137058).

Almost surely, 2^20456855 is an apocalyptic number.

20456855 is a deficient number, since it is larger than the sum of its proper divisors (4091377).

20456855 is an equidigital number, since it uses as much as digits as its factorization.

20456855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091376.

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

The square root of 20456855 is about 4522.9254913164. The cubic root of 20456855 is about 273.4930464896.

The spelling of 20456855 in words is "twenty million, four hundred fifty-six thousand, eight hundred fifty-five".