20436085 has 4 divisors (see below), whose sum is σ = 24523308. Its totient is φ = 16348864.

The previous prime is 20436079. The next prime is 20436089. The reversal of 20436085 is 58063402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2745649 + 17690436 = 1657^2 + 4206^2 .

It is a cyclic number.

It is not a de Polignac number, because 20436085 - 2⁹ = 20435573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20436089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2043604 + ... + 2043613.

It is an arithmetic number, because the mean of its divisors is an integer number (6130827).

Almost surely, 2^20436085 is an apocalyptic number.

It is an amenable number.

20436085 is a deficient number, since it is larger than the sum of its proper divisors (4087223).

20436085 is an equidigital number, since it uses as much as digits as its factorization.

20436085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4087222.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20436085 is about 4520.6288279398. The cubic root of 20436085 is about 273.4004552917.

Adding to 20436085 its reverse (58063402), we get a palindrome (78499487).

It can be divided in two parts, 2043 and 6085, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 20436085 in words is "twenty million, four hundred thirty-six thousand, eighty-five".