20448013 has 4 divisors (see below), whose sum is σ = 21000700. Its totient is φ = 19895328.

The previous prime is 20448007. The next prime is 20448019. The reversal of 20448013 is 31084402.

20448013 = 3197² + 3198².

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

It is an interprime number because it is at equal distance from previous prime (20448007) and next prime (20448019).

It can be written as a sum of positive squares in 2 ways, for example, as 10227204 + 10220809 = 3198^2 + 3197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20448013 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 (20448019) 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, 276288 + ... + 276361.

It is an arithmetic number, because the mean of its divisors is an integer number (5250175).

Almost surely, 2^20448013 is an apocalyptic number.

20448013 is the 3198-th centered square number.

It is an amenable number.

20448013 is a deficient number, since it is larger than the sum of its proper divisors (552687).

20448013 is an equidigital number, since it uses as much as digits as its factorization.

20448013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552686.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20448013 is about 4521.9479209739. The cubic root of 20448013 is about 273.4536371407.

The spelling of 20448013 in words is "twenty million, four hundred forty-eight thousand, thirteen".