19912693 has 4 divisors (see below), whose sum is σ = 19923660. Its totient is φ = 19901728.

The previous prime is 19912691. The next prime is 19912709. The reversal of 19912693 is 39621991.

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 9108324 + 10804369 = 3018^2 + 3287^2 .

It is a cyclic number.

It is not a de Polignac number, because 19912693 - 2¹ = 19912691 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 (19912691) 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, 2038 + ... + 6631.

It is an arithmetic number, because the mean of its divisors is an integer number (4980915).

Almost surely, 2^19912693 is an apocalyptic number.

It is an amenable number.

19912693 is a deficient number, since it is larger than the sum of its proper divisors (10967).

19912693 is an equidigital number, since it uses as much as digits as its factorization.

19912693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10966.

The product of its digits is 26244, while the sum is 40.

The square root of 19912693 is about 4462.3640595541. The cubic root of 19912693 is about 271.0462060890.

The spelling of 19912693 in words is "nineteen million, nine hundred twelve thousand, six hundred ninety-three".