20543065 has 8 divisors (see below), whose sum is σ = 25117128. Its totient is φ = 16124160.

The previous prime is 20543063. The next prime is 20543093. The reversal of 20543065 is 56034502.

It can be written as a sum of positive squares in 4 ways, for example, as 802816 + 19740249 = 896^2 + 4443^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20543065 - 2¹ = 20543063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20543063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38496 + ... + 39025.

It is an arithmetic number, because the mean of its divisors is an integer number (3139641).

Almost surely, 2^20543065 is an apocalyptic number.

It is an amenable number.

20543065 is a deficient number, since it is larger than the sum of its proper divisors (4574063).

20543065 is an equidigital number, since it uses as much as digits as its factorization.

20543065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77579.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20543065 is about 4532.4458077290. The cubic root of 20543065 is about 273.8766960782.

Adding to 20543065 its reverse (56034502), we get a palindrome (76577567).

The spelling of 20543065 in words is "twenty million, five hundred forty-three thousand, sixty-five".