20354261 has 4 divisors (see below), whose sum is σ = 20366124. Its totient is φ = 20342400.

The previous prime is 20354239. The next prime is 20354281. The reversal of 20354261 is 16245302.

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 8236900 + 12117361 = 2870^2 + 3481^2 .

It is a cyclic number.

It is not a de Polignac number, because 20354261 - 2¹⁸ = 20092117 is a prime.

It is a super-2 number, since 2×20354261² = 828591881712242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20354221) 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, 2810 + ... + 6971.

It is an arithmetic number, because the mean of its divisors is an integer number (5091531).

Almost surely, 2^20354261 is an apocalyptic number.

It is an amenable number.

20354261 is a deficient number, since it is larger than the sum of its proper divisors (11863).

20354261 is an equidigital number, since it uses as much as digits as its factorization.

20354261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11862.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20354261 is about 4511.5696824941. The cubic root of 20354261 is about 273.0350780332.

Adding to 20354261 its reverse (16245302), we get a palindrome (36599563).

The spelling of 20354261 in words is "twenty million, three hundred fifty-four thousand, two hundred sixty-one".