19988013 has 4 divisors (see below), whose sum is σ = 26650688. Its totient is φ = 13325340.

The previous prime is 19988009. The next prime is 19988041. The reversal of 19988013 is 31088991.

It is a happy number.

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 not a de Polignac number, because 19988013 - 2² = 19988009 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 (19988083) 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, 3331333 + ... + 3331338.

It is an arithmetic number, because the mean of its divisors is an integer number (6662672).

Almost surely, 2^19988013 is an apocalyptic number.

It is an amenable number.

19988013 is a deficient number, since it is larger than the sum of its proper divisors (6662675).

19988013 is an equidigital number, since it uses as much as digits as its factorization.

19988013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662674.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 19988013 is about 4470.7955667867. The cubic root of 19988013 is about 271.3875212818.

It can be divided in two parts, 1998 and 8013, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 19988013 in words is "nineteen million, nine hundred eighty-eight thousand, thirteen".