20438897 has 4 divisors (see below), whose sum is σ = 20448996. Its totient is φ = 20428800.

The previous prime is 20438863. The next prime is 20438909. The reversal of 20438897 is 79883402.

20438897 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8667136 + 11771761 = 2944^2 + 3431^2 .

It is a cyclic number.

It is not a de Polignac number, because 20438897 - 2¹⁰ = 20437873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20438497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 848 + ... + 6449.

It is an arithmetic number, because the mean of its divisors is an integer number (5112249).

Almost surely, 2^20438897 is an apocalyptic number.

It is an amenable number.

20438897 is a deficient number, since it is larger than the sum of its proper divisors (10099).

20438897 is an equidigital number, since it uses as much as digits as its factorization.

20438897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10098.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 20438897 is about 4520.9398359191. The cubic root of 20438897 is about 273.4129946605.

The spelling of 20438897 in words is "twenty million, four hundred thirty-eight thousand, eight hundred ninety-seven".