20826281 has 4 divisors (see below), whose sum is σ = 23801472. Its totient is φ = 17851092.

The previous prime is 20826271. The next prime is 20826331. The reversal of 20826281 is 18262802.

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 20826281 - 2¹⁰ = 20825257 is a prime.

It is a super-2 number, since 2×20826281² = 867467960581922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20826251) 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, 1487585 + ... + 1487598.

It is an arithmetic number, because the mean of its divisors is an integer number (5950368).

Almost surely, 2^20826281 is an apocalyptic number.

It is an amenable number.

20826281 is a deficient number, since it is larger than the sum of its proper divisors (2975191).

20826281 is an equidigital number, since it uses as much as digits as its factorization.

20826281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2975190.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20826281 is about 4563.5820360765. The cubic root of 20826281 is about 275.1295521817.

The spelling of 20826281 in words is "twenty million, eight hundred twenty-six thousand, two hundred eighty-one".