20854881 has 8 divisors (see below), whose sum is σ = 30896160. Its totient is φ = 13903236.

The previous prime is 20854853. The next prime is 20854891. The reversal of 20854881 is 18845802.

It is not a de Polignac number, because 20854881 - 2⁵ = 20854849 is a prime.

It is a super-2 number, since 2×20854881² = 869852123048322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20854891) 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, 386175 + ... + 386228.

It is an arithmetic number, because the mean of its divisors is an integer number (3862020).

Almost surely, 2^20854881 is an apocalyptic number.

It is an amenable number.

20854881 is a deficient number, since it is larger than the sum of its proper divisors (10041279).

20854881 is an equidigital number, since it uses as much as digits as its factorization.

20854881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772412 (or 772406 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 20854881 is about 4566.7144644701. The cubic root of 20854881 is about 275.2554364910.

The spelling of 20854881 in words is "twenty million, eight hundred fifty-four thousand, eight hundred eighty-one".