20424881 has 4 divisors (see below), whose sum is σ = 20449572. Its totient is φ = 20400192.

The previous prime is 20424869. The next prime is 20424893. The reversal of 20424881 is 18842402.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20424869) and next prime (20424893).

It can be written as a sum of positive squares in 2 ways, for example, as 18490000 + 1934881 = 4300^2 + 1391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20424881 is a prime.

It is a super-2 number, since 2×20424881² = 834351527728322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20424841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11060 + ... + 12773.

It is an arithmetic number, because the mean of its divisors is an integer number (5112393).

Almost surely, 2^20424881 is an apocalyptic number.

It is an amenable number.

20424881 is a deficient number, since it is larger than the sum of its proper divisors (24691).

20424881 is an equidigital number, since it uses as much as digits as its factorization.

20424881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24690.

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 20424881 is about 4519.3894499147. The cubic root of 20424881 is about 273.3504825978.

The spelling of 20424881 in words is "twenty million, four hundred twenty-four thousand, eight hundred eighty-one".