20179013 has 4 divisors (see below), whose sum is σ = 20188428. Its totient is φ = 20169600.

The previous prime is 20179001. The next prime is 20179021. The reversal of 20179013 is 31097102.

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 7491169 + 12687844 = 2737^2 + 3562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20179013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20179013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20179813) 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, 245 + ... + 6357.

It is an arithmetic number, because the mean of its divisors is an integer number (5047107).

Almost surely, 2^20179013 is an apocalyptic number.

It is an amenable number.

20179013 is a deficient number, since it is larger than the sum of its proper divisors (9415).

20179013 is an equidigital number, since it uses as much as digits as its factorization.

20179013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9414.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 20179013 is about 4492.1056309931. The cubic root of 20179013 is about 272.2492174133.

The spelling of 20179013 in words is "twenty million, one hundred seventy-nine thousand, thirteen".