20019613 has 4 divisors (see below), whose sum is σ = 20065248. Its totient is φ = 19973980.

The previous prime is 20019607. The next prime is 20019617. The reversal of 20019613 is 31691002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20019613 - 2⁵ = 20019581 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 (20019617) 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, 22153 + ... + 23038.

It is an arithmetic number, because the mean of its divisors is an integer number (5016312).

Almost surely, 2^20019613 is an apocalyptic number.

It is an amenable number.

20019613 is a deficient number, since it is larger than the sum of its proper divisors (45635).

20019613 is an equidigital number, since it uses as much as digits as its factorization.

20019613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45634.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 20019613 is about 4474.3282177328. The cubic root of 20019613 is about 271.5304624589.

The spelling of 20019613 in words is "twenty million, nineteen thousand, six hundred thirteen".