20319485 has 4 divisors (see below), whose sum is σ = 24383388. Its totient is φ = 16255584.

The previous prime is 20319469. The next prime is 20319487. The reversal of 20319485 is 58491302.

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 12773476 + 7546009 = 3574^2 + 2747^2 .

It is a cyclic number.

It is not a de Polignac number, because 20319485 - 2⁴ = 20319469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20319487) 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, 2031944 + ... + 2031953.

It is an arithmetic number, because the mean of its divisors is an integer number (6095847).

Almost surely, 2^20319485 is an apocalyptic number.

It is an amenable number.

20319485 is a deficient number, since it is larger than the sum of its proper divisors (4063903).

20319485 is an equidigital number, since it uses as much as digits as its factorization.

20319485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4063902.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20319485 is about 4507.7139438966. The cubic root of 20319485 is about 272.8794925832.

The spelling of 20319485 in words is "twenty million, three hundred nineteen thousand, four hundred eighty-five".