20255881 has 8 divisors (see below), whose sum is σ = 21818720. Its totient is φ = 18742752.

The previous prime is 20255839. The next prime is 20255897. The reversal of 20255881 is 18855202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20255881 is a prime.

It is a super-2 number, since 2×20255881² = 820601430172322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20255981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11580 + ... + 13213.

It is an arithmetic number, because the mean of its divisors is an integer number (2727340).

Almost surely, 2^20255881 is an apocalyptic number.

It is an amenable number.

20255881 is a deficient number, since it is larger than the sum of its proper divisors (1562839).

20255881 is a wasteful number, since it uses less digits than its factorization.

20255881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24855.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 20255881 is about 4500.6533970080. The cubic root of 20255881 is about 272.5944727566.

The spelling of 20255881 in words is "twenty million, two hundred fifty-five thousand, eight hundred eighty-one".