20456881 has 4 divisors (see below), whose sum is σ = 20480832. Its totient is φ = 20432932.

The previous prime is 20456879. The next prime is 20456941. The reversal of 20456881 is 18865402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20456881 - 2¹ = 20456879 is a prime.

It is a super-2 number, since 2×20456881² = 836967960496322, which contains 22 as substring.

It is a Duffinian number.

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

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 3 ways as a sum of consecutive naturals, for example, 10645 + ... + 12418.

It is an arithmetic number, because the mean of its divisors is an integer number (5120208).

Almost surely, 2^20456881 is an apocalyptic number.

It is an amenable number.

20456881 is a deficient number, since it is larger than the sum of its proper divisors (23951).

20456881 is an equidigital number, since it uses as much as digits as its factorization.

20456881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23950.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 20456881 is about 4522.9283655614. The cubic root of 20456881 is about 273.4931623565.

The spelling of 20456881 in words is "twenty million, four hundred fifty-six thousand, eight hundred eighty-one".