19988693 has 4 divisors (see below), whose sum is σ = 20194860. Its totient is φ = 19782528.

The previous prime is 19988687. The next prime is 19988699. The reversal of 19988693 is 39688991.

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 (19988687) and next prime (19988699).

It can be written as a sum of positive squares in 2 ways, for example, as 5189284 + 14799409 = 2278^2 + 3847^2 .

It is a cyclic number.

It is not a de Polignac number, because 19988693 - 2⁶ = 19988629 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 (19988699) 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, 102938 + ... + 103131.

It is an arithmetic number, because the mean of its divisors is an integer number (5048715).

Almost surely, 2^19988693 is an apocalyptic number.

It is an amenable number.

19988693 is a deficient number, since it is larger than the sum of its proper divisors (206167).

19988693 is an equidigital number, since it uses as much as digits as its factorization.

19988693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206166.

The product of its digits is 839808, while the sum is 53.

The square root of 19988693 is about 4470.8716152446. The cubic root of 19988693 is about 271.3905988167.

The spelling of 19988693 in words is "nineteen million, nine hundred eighty-eight thousand, six hundred ninety-three".